Love watching this dude's videos. Regarding his physique, he looks okay. Is he cut? No, but he's not exactly skinny or skinny fat either. In some of those shots, his forearms and calves look pretty decent.
Regarding his deal mentally, not sure what's going on there, but at the very least dude is not autistic. That's a term that's thrown around a lot, but he would not meet the strict dsm criteria for autism I can guarantee you that. He's waaaaay to personable and engaging with others. You'd never hear a true autistic talking about all their friend and being so engaging with the the cameraman and other guys in the gym. Personally, I'm still not convinced this isn't just an act. Whatever it is though, he's funny as hell and i'll keep watching.