Most users on this forum have heard of this guy at least at some point. He is a very toxic individual indeed. It’s hard to understand what motivates such disbelief and resentment in a person like that. However, spare yourself the energy. There’s little point in trying to talk to a person who does not want to listen. You could go into the comment section and hopefully convince one or two guys not to take finasteride but in the end you can’t warn people who don’t want to listen.
With more research and awareness on our side, we might be able to flag and report such Youtube channels in the future and get them shut down for dangerous advertisement of toxic medications.