Headline reader here but it does say “detrimental” which I admit may include said personality traits in some eyes but I would expect “detrimental” to mean side-effects that actually negatively impact quality of life.
If something has detrimental effects (dyeing on ziplines) that are outweighed by positive effects (lower blood pressure), it is not fair to say it has no detrimental effects whatsoever.
However I would say the biggest issue with the title is that it doesn't mention the number receiving psilocybin. 60 people is not a lot to say it has no detrimental effects, even if it weren't turning people into hippies.