Earlier quoted context omitted.
Here's Plato's thing, the "myth of Er": https://en.wikipedia.org/wiki/Myth_of_Er What are the unaccountably unlikely commonalities that I should be noticing? Between this and the article, I see only: some kind of colored light, some kind of officiating beings, and a river (A.J.Ayer says he presumably had the Styx in mind, though amusingly in the actual ancient Greek account it's a different river and there's no need…
So it has the same stages as modern NDEs: - Out of body experience - Journey through realms - Bright/universal light - Life review - Encounters with spiritual beings - Reincarnation / life selection - A message of peace, well-being, and survival of consciousness I've never heard of life reviews for example outside of NDEs, most of these things are not in the collective unconscious.
Yeah, look at https://en.wikipedia.org/wiki/List_of_flood_myths . This does not mean that at some point there was a global flood brought about by a deity in retribution. It just means people throughout time knew the same stories or invented the same stories, and often thought about deities and floods. Similarly with your afterlife tropes. Memes are the freaky thing here.