For which point his illustration is much, much likelier to be accepted if it DID indeed happen; otherwise he will be fair game for charges of just making up justifications for getting high. Thus the desire for factual corroboration.
A fiery sermon from some 17th century Puritan, denouncing the instruments as "tools of sorcery"or whatever would be slim evidence, as EVERY technology has been denounced as such at some time. As pointed out, Galileo’s conclusions (and even more so his smart-aleck, politically incorrect, authority-tweaking way of publishing them) were censured by the Roman Church: but NOT the experimental methods or the instruments.
Oh, and BTW, Aldous Huxley, THAT was insight from psychedelic experimentation. Beatles? Popularizers.