Their microdosing experimentation was questionable. Not methodically, it was quite thorough, but iirc they used unknown strength street blotters and derived all further experimentation from that.
Some current theories re: microdosing efficacy that I've seen are that people who report benefits from microdosing (beyond placebo) are inadvertently self medicating ADHD symptoms, which seems plausible, given LSDs stimulant effect and 5HT2A affinity.