This thread is embarrassing. The dude did NOT squat 600 pounds. Not to any appreciable depth, at least. And to suggest the female did over 600 is so beyond asinine it's incomrehensible.
It's like those dudes who put three 45s on the Smith machine and say it's 315. Uh, no. Beyond the bar being counterbalanced so it's actually only about 15 pounds as opposed to 45, the degree of difficulty to perform with the weight is hugely decreased, as well.
I see cats load a bar with 300-plus and put it on their backs all the damn time. Doesn't mean they actually perform anything remotely resembling a legitimate squat.
Ben Johnson used to train periodically at gyms I frequented. He was a "heavy" squatter, too. But again, his reps were WAY high. Parallel? Hell, not even close to being half squats. No disrespect to him, either. Ben was a freak sprinter, no question. But let's be real here, can we?