Mark,
I'm no coach but have read all your books and have had a decent amount of success with your programs (even at 40 now). I am no advocate of a high bar squat. I just recently decided to call my LP at the highest I've ever attained before feeling like recovery is inadequate.
That being said I've never even gotten close to a 90-degree angle from vertical (which he seems to be doing). Even if the angle is "correct," for his anthropometry his bar path is over his toes on the bottom half of the movement because of the forward lean.
At the very least I'd like to help him correct this. If you feel there is no need for correction, I'll tell him to just keep adding weight and eat more (which he won't do).
Final LP PR:
425 Pause - YouTube
Dad Angles:
IMG_2289.jpg