Thanks for the "The Case Against DMT Elves". The article tries to drive home the point that encounters are solely results of our imagination. But this is not about differences but about underlying similarities between experiences of different peoples and cultures at different periods of history and prehistory. They all gave descriptions of what appear to have been the same intelligent, communicative, non-physical "entities". So it's hard to accept "imagination" as cause when there's no evidence for any external real-world stimulus for people from different backgrounds and from different periods of history to have massively recurrent shared cross-cultural experiences.
Graham Hancock's premise is that the brain could be as much as a receiver as a generator of consciousness. He makes a valid point that other dimensions are accounted for not just by all religious traditions but quantum physics today.