It's not a well supported theory, but fascinating. Possibly an epigenetic influence? Much more likely a cultural effect, if any, that nudged early humans down the path of spiritual pursuit as a sort of cultural glue. The more spiritually inclined you were, the more likely you were to thrive in the societal hierarchy.

Use of psychedelics could have helped accelerate an individual's "spiritual" development and therefore afforded them additional offspring. So the correlation, if any, might be a favoring of genes that paired well with the effects of psychedelics. Pure speculation on my part.

As for AI, it seems highly likely a new class of designer drugs will emerge, tailored to a specific individual to enhance societal adaptation. We've already seen this in play over the past 40+ years in the pharmaceutical industry. AI will only accelerate it IMO.