To be fair, I think Burke did that himself, the whole thing was super weird.
E. Barnett is 16 now? If that's the case, then he knows absolutely nothing, there is no way he can remember what happened or didn't happen back when he was a little kid. I haven't seen the comment (I gave up on watching any videos with these people), but if Michael is referred to Michael and not dad, it could be because a) E. Barnett was not the one who wrote the comment; or b) E. Barnett was trying to hide the fact that Michael is his father, but then, why comment with his real name? And it's clear that he has to be close to the family or family to know all of that so, my guess is a).