In a trap bar deadlift your legs are going through about a 1/4 squat. Compare this to the ROM your back is going through…your entire back is going to much more of a limiting factor.
You’re giving conflicting advice. Telling him to sit far back and remain upright is a nice way to fall over backwards. What kind of squat allows you to remain the most upright? An olympic, which is the squat you sit back the least. 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.
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.
This makes no sense.
A great lift for whom? Everyone? Or geared powerlifters, which is all of Westside.
Stretching the hamstrings is unlikely to correct any lower back issues. But it is likely to cause even greater issues.
From what I’ve read, it doesn’t seem like you have any lower back issue. The real issue seems you are afraid to lean forward while squatting. Just because you lean forward more than most while squatting, because of your proportions, doesn’t mean your lower back is at greater risk for injury nor does it mean your lower back is what’s limiting you in the exercise.