Namaste to Non-Hindus reading this thread
In my 50 years of Hinduism in this life, I have honestly never heard a fellow Hindu refer to Jesus as a Preta (I will get to the translation of this word in a minute).
This could be in part due to hardly any discussions between Hindus dwell on Jesus or the subject matter of this post, so it could be some Hindus think this but because there is no dialog happening on Jesus as I recall, this matter of thinking Jesus is a Preta has never come up in my life even though JS has mentioned it - which makes me think in general this is an obscure if not aberrant idea.
I have heard ISKCON devotees use the term pretas (but not in context of Jesus), generally it is a negative term, and I have seen Chinese Buddhist works use the term which sometimes gets translated as "hungry ghost". I am not sure I agree with this translation, but in general I see a wandering after-life form that is undergoing some sort of suffering, but it can in some context refer to any deceased person which eventually will happen to all of us as far as the lifespan of our current body.
In some villages, pretas have almost supernatural powers, albeit still ghostly.
Personally, as a Hindu, I do not believe Jesus was or is pretas. But this does not mean "ghost" to me, for me a more proper term for ghosts is bhutas. Pretas is a subtile body (which we have like a sheath over us) which can be invoked out by some priests during death rituals that will voluntarily travel to Yamaraj instead of the other way around, but may "stop here and there" on the way (but this is not a ghost or bhuta).
I do not think Jesus was or is a bhuta either, again as a Hindu I have not heard such a belief of Jesus as a Preta and I am pretty sure it is not in Hinduism.
However, some Sri Lankan Buddhists may think this. In the 18th Century there were a set of 74 palm-leaf folios consisting of 3 tales discovered, probably authored at that time of Buddhist-Christian encounters, the tales are Buddhist of which one tells of a Carpenter Preta (e.g. Jesus). This Nazarin was sent by Mara and has powers. However, there are words also linking this "Preta" to Krishna or Krishnaya the Hindu avatar and not just Jesus.
I suspect JS has some knowledge of these folios, which are actually not only a Buddhist view of Catholic Jesus in negative light, but also an attack on Hinduism and Krishna and sort of presents an idea that the Nazarin (Jesus) and Krishnaya are "the same" trickster from Mara.
Just saying ... this isn't Hinduism, in fact it is Buddhist and is in fact tales or belief that attack Hinduism and Christianity together.
There has been some synchronicity between Hinduism and some Buddhism in Sri Lanka (Ceylon), not coming from Buddhists but from Hindus, in the 18th and 19th Centuries. For example, some Hindu Temples in Lanka have Buddhist priests doing the puja. So to be fair, some Tamil Hindus may have also adopted a bit of the Jesus Preta idea too, but I find no hard evidence of this, it is not Hindu and is both a negative depiction of Jesus and Krishna. But this does not seem to exist today among Ceylonese Hindus at all, and is a "dead fairy tale".
Also, it may not be a wise idea for Hindus to adopt an outdated defunct Buddhist agenda aimed at attacking Hindus and Christians both.
Om Namah Sivaya