Leg Press

The box squat, without question.

An olympic, which is the squat you sit back the least.
For a person of the OP’s stature, this is absolutely incorrect. It is very common for athletes of the OP’s stature to lean forward excessively in a free Olympic squat. That’s what he’s been doing, essentially, and he’s just told you it requires him to lean excessively.

What kind of squat do you lean most forward? An equipped powerlifting squat, which is the squat you sit back the most. The more they sit back / lean forward the more they get out of their gear.
He’s not wearing gear, so this is irrelevant.

The only reason the kid in the video seems upright is because he is rocking on the box. Take the box away from him, or take away his relaxing on the box and use of momentum, and he won’t be as upright.
He doesn’t SEEM to be upright, he is upright. And yes, if you took away the box he won’t be as upright…so why are trying to take away the OP’s box?
A great lift for whom? Everyone? Or geared powerlifters, which is all of Westside.
Great for everyone I know who has had issues with free squatting and who has given box squats a real try. The vast majority of these indivduals NEVER squat in gear…those that do squat in gear don’t use the box squat as much unless they are several weeks from a comp.