I only watched the squat video...this guy obviously has never lifted much weight. First he has all the bar's weight on his hands, you can tell because his wrists are bent all the way back--you get heavy load back there and grip it like that and your wrists are gonna be sore for weeks. Then, he squats with a narrow spread (his knees don't go out to the side any when he squats) which will cause your knees to push up against your stomach and won't let you go all the way down, which in turn will put an inordinate amount of stress straight on the knees. Get those damn knees out.
I don't think I'd trust this guy, he doesn't look like he's ever actually lifted very much.