I agree with Aup on the 500 years later, that is probably about right, what I was taught really isn't date specific but definetly sequential.
As for Soma, I have no idea what it is, but definetly Indra and such drank it. I would personally hesitate to drink it myself, also I still think it is DISTINCT from general Amrita or "nectar" (of the Gods) ... and Soma definetly was "conscious changing", almost like a drug maybe. But we may never know, my gut is however that very clever humans are going to figure out and prove what was the actual Soma.
As far as the emotions about "sequences" of things and dates and such ...
... This is similar to a conversation I had a few years ago with someone who was a member of a particular Christian sect, and also involved a denial of sequential events that take us into the modern times.
It had to do with the term "The Bible".
What was told to me was "The Bible" was about the creation of the world, Adam and Eve, the Flood, various wars and Prophets, and so on, and eventually about Jesus who was the "essence of the Bible", it's "conclusion" both as the final Chapter of God's Book "The Bible" and in Jesus is the entire spirit of the Bible itself. All this was "The Bible" - "the very" book. And the Book of Revelations of one of Jesus' disciples is also "The Bible" and a look into the future.
This entire scripture is called "The Bible" according to my friend who then got very angry with my perspective. Let me explain.
There are many extremely engaging aspects in "The Bible", and it is recommended reading. But I had already taken, even if it was not a theological view, and certainly not a "scholarly" deep dive - just getting up to speed from basic "reviews" and hard work of others, many of which were not theologians, but nor were they "anti-Christian" and meany critics, they were simply smart people who were looking at the historical sequence of "things" - I had already taken a look at things and it seemed pretty clear to me that, really, "The Bible", it was some "Bibles" that even included for example parts of the great Gilgamesh Epic and the Flood, but it was largely Jewish, had a "sequence of events" (first, second, third thing happened, and so on, in "this order"), yes it is often difficult to ascribe an extra "date" which is questionable even sometimes using "modern methods" but it is clear "this was before that, this came later" and so on even if we don't know the exact date necessarily.
So anyway, I had casually mentioned that it seems clear to me that the Jesus part of "The Bible" came later, that really it isn't the Jewish Bible, which itself is sort of Bibles instead of Bible, and it seems to me the Jesus part should rather be called the "New Testament" and not "The Bible" and really isn't so much Jewish, it was added later, an Appendix if you will, tacked onto the back of "The Bible" later by disciples and others who were also Jewish and non-Jewish and Romans and such, and really is NOT "The Bible", the New Testament is of great insight and of immense history, but is not "The Bible", it came later. In fact, quite a bit later by hundreds of years, probably 500 years later, and actually Jesus and really the spirit of the New Testament is against, critic of, a "clarification" in Christian terms, of the rituals and such of The Bible, but not "The Bible".
The guy went totally bezerker on me.
"How DARE you!" say it isn't "The Bible", and things like "Are you Jewish?" as if I cannot see something about "The Bible" in any "scholarly way" because I am from California and not born in "The Holy Lands", on it went. The Jesus part of "The Bible" is "the VERY ESSENCE and CONCLUSION of WHAT IS THE BIBLE!" and "IS The Bible" - so it was yelled at me, and I am a fool and so on.
I still liked the guy per say, but it was clear he didn't subscribe to my "view". Which is ok. But I still think what I have learned is correct, that the Jesus part came later, after the Bible(s), is not The Bible or Bibles, it was tacked on later and really an Appendix of sorts but not THE Bible.
So, I am sure the New Testament QUOTES The Bible. But is not THE. I am not going to be persuaded by this guy, that's for sure.
It is like this "conversation" I once had with a caste extremist who was a "theologian" of the Shri Kanchi Kamakoti Peetham. The initial conversation was about caste, the guy was a caste extremist, but let us put that aside, this is a "Mutt" that claims to be established in Kanchi (Tamil Nadu, South India) by Sri Adi Sankara in "the year 482 B.C.", but having been to India more than a dozen times and for extended periods, and though I haven't yet been to Tamil Nadu, it was sort of clear to me that this "Mutt" or Head Quarters if you will of this Kanchi sect came LATER, after Adi Shankaracharya died, and also these claims he died at Kanchi Mutt are bogus, that in fact this Mutt came way later than Shankara, no Tamil, Sanskrit or Malayalam literature before 19th century speaks of Kanchi Mutt, it came LATER and Shankaracharya did NOT "establish" this Mutt, and speaking of the Vedas, each Mutt was assigned one Veda of the Four, the Jyothir Mutt at Badrinath in northern India with Atharva Veda, Sarada Mutt at Sringeri in southern India with Yajur Veda; Govardhan Mutt at Jaganath Puri in eastern India with Rig Veda and Kalika Mutt at Dwarka in western India with Sama Veda. He didn't establish any such Mutt in Kanchi, which caste extremist Tamil Iyer's of South India essentially made this up to give themselves an elitist "badge of honor" in modern British times in India and really even their "Brahmin" caste claims are dubious and they are Dravidians pretty much, there is nothing wrong with this except the denial of the "sequence" of things and no, they have no "authority" from being "established" by Shankara even if these Tamils "heard about Shankara" later, Shankara who was clearly influenced by Buddhists and Jains but is a wonderful Hindu.
So of course this guy goes bezerker on me. "How DARE you!" stuff, and "are you even one of the Trice born!" (caste stuff) or "even a Hindu!?!?"...
So it goes. There are some wonderful Hindu writings from this "Pope style Mutt", welcome to the Family of Hinduism, but Shankara you are not, but there is a sequence to things. These Tamils of this "Mutt" even set up allow a lineage of pontiffs like the Pope, it is very clear it has nothing to do with being established by Shankara, and totally is a British Era invention and power grab by caste extremists. No one is going to "persuade" me otherwise to what is clear and actually TAUGHT by much more "ancient" authorities, certainly not by yelling because you might lose some of your elitism, or for that matter what comes from impersonists of the flowerly Vedantism "supremacy", or thuse who simply construct very dubious caste status, or any such thing. Not all Hindus agree, no reason to get all huffy over identity crisis.