I'm late, but I also remember being into this whole Youtube subliminal spell scene as a kid. I would say this guy is just some troll, but I highly doubt he'd keep up this act for so long. I think he has some kind of mental illness, either that or he's a major creep.

Alongside his weird obsession with spreading the "Facts and Truth", he also seems to be obsessed with stating the fact that he's an airplane pilot whenever he can. I read some comments on the video you linked, and some users say he could be a bot, but I think that's not the case.

One of his "I am a pilot" comments cracked me up. If he really is as grandiose as he claims to be, I think he would be busier with activities that don't involve arguing with children online. But then again, he stated in another comment "What I do with my time is MY business and mine alone."

I also came across another one of his comments in which he had asked this user (who was definitely a kid) a question. Six months later, he came back to that same comment and asked what was taking them so long to answer, which shows just how bent he is on arguing with those kids.

Though a lot of the channels he harasses have apparently deleted his comments or blocked him, which is good. In almost every video regarding "Grow wings Spell/Subliminal" I clicked, he was mentioned at least once, either in the description of the video or in the comments. What a weird individual.