Theory: It had no effect because his sadhana already crossed the zone of consciousness LSD moves one to.
In advanced meditation alot of “effort” is spent on ignoring ephemeral phenomena including the kinds of visual and auditory phenomena LSD induces. An expert meditator at his level would likely be able to move freely into the “LSD Frequency” and out again with no drugs required.
I think it had an effect, but it is possible that, through meditation, he had already achieved similar states of mind and become adept at controlling/navigating them.
This is totally anecdotal and based only on experiences I've had though. It's hard to make blanket statements about the nature of psychedelics.
I call bullshit on that. Besides the rampant charlatanism that infects the "expert" meditator community, my own multi-decade experience with meditation tells me that anyone who compares it to LSD or other strong psychedelics doesn't know what he's talking about.
You could be meditating for 10 years and not come anywhere near close to what 1 hit of LSD unveils about the mind and "you".
To be fair, we have no way to disprove anything about another person's subjective experience. Someone could have a special aptitude or talent in "meditation", broadly speaking. Our own accomplishments may not be any indication.
Everyone's experience of sweetness may indeed be different, but at least the standard way to induce the experience of sweetness is ubiquitous and immediate. Just taste sugar. Decades of meditative experience is far less commonly found.
I also have "multi-decade experience with meditation" and, to me, LSD is a kind of toy. (Not in the sense of something to give to kids to play with, but rather in the sense of something not worth the time of sober seekers.)
In advanced meditation alot of “effort” is spent on ignoring ephemeral phenomena including the kinds of visual and auditory phenomena LSD induces. An expert meditator at his level would likely be able to move freely into the “LSD Frequency” and out again with no drugs required.