People are already biased against him (not here to comment about it though so whatever), but I think he's not on the wrong here. People say he's "profiting" on the subject, but to be honest this accusation affected both his career and personal life, at least in my opinion he has every right to comment about it and also alert about those things.
Kpop idols really have a lot to handle and being falsely accused in the Internet era where things spread fast can do irreversible damage even to their mental health.
I haven't seen the doc, mainly because I have no interest in him lol, but I really don't see anything wrong about him trying to prove he's innocent.