LOL, are you saying if
@Polymath257 says something it is beyond needing to be discussed further, LOL.
George, we have already argued about consciousness in other older threads, so you should already know that I have disagree with you about consciousness existing independent of the physical.
Since the article from the OP was written for Psychology Today, we can assume it is talking about consciousness of humans, not of other animals, or alien life forms, or plants or bacteria.
So with that in mind, consciousness cannot exist without life, without brain.
The brain controlled every single functions of the body (motor function, heart, lungs, liver, kidney, all sensory organs), as well as thinking, memory, dreams, emotions, and so on, and consciousness.
All of the above, are pretty much evidences, through studies of human biology and in medicine.
The claim that consciousness existing externally and independently, have never been demonstrated, through verifiable evidences; largely because it is just pure conjecture.
There are no such thing as "pure consciousness", let alone "transcendent consciousness" or "ultimate consciousness", these superlative adjectives are nothing more than superficial window dressing and unsubstantiated woo.
And my alternate view is that Consciousness/Brahman/God came before the physical. The universe is a thought-form of Brahman/God.
Also I believe there are non-physical beings that are conscious on the higher (spiritual) planes of reality (that obviously are not dependent on physical brains).
And here are the woo.
There are never any demonstration of higher planes of reality, such as that of spirits or spiritual, other than in religions, in esoteric philosophies, in myths, in sci-fi and paranormal fictions, in delusions, and worse of all, from fraudulent activities.