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.
Everything is always okay in the end, if it's not, then it's not the end.