Definitely not true. LSD is one of the purest recreational drugs you can buy. If it's LSD it's 'good' LSD. Occasionally dox or nbome are sold as LSD but even that is relatively rare. Also you can just order it online.
You gotta test. Don't dismiss the need to test.
There was a time "just using Amazon" meant a whole setup that was not ubiquitous. People also are passionate about making darknet seem like a scary place, I've seen many askreddit threads about the "scariest thing you've seen on darknet" with anything to the contrary losing consensus very quickly. Found that odd and contrived.
Not as easy as amazon of course but often easier than depositing money in a poker site for example.
And that's not even mentioning that you can just legally order 1p-lsd on the clearnet the same way you'd order anything (though the UK, Germany and a few others have clamped down on it a bit).
How do you figure?