Is it possible that it was fumarate and thus interpreted it as purity, hence too pure to smoke? It's my understanding you don't smoke fumarate right?

Your understanding is right

I think you guys are forgetting that he mentioned something that his friend had less than 1 half of 1/16th of a capsule. Well, I don`t see how that could be pharma, unless this is a horse capsule.

My money would be on an RC of some kind, but the guy needs to educate himself.
There is nothing I hate worse than drug myths and rumors. Well, not true, but it certainly irritates me.

Just keep in mind, that there are many DMTs out there...no only the beloved one, this site is dedicated to. What about i.e. 4-AcO-DMT?

"The primary effects of O-acetylpsilocin seem to typically last 4–6 hours."

"A dose of O-acetylpsilocin is 8 mg - 30 mg."

And as this usually appears in salt form, it could fit, imho. So the guy could be right in the end about that this was at least a kind of DMT.