Dudes are fond of saying, “I will only learn from someone who has done what I want to do.”
The coach will never be able to do a tall guy squat, but understands the mechanics and the way to communicate them so the tall guy can fix his form.
How many other tall guys has this guy did squats with who couldn’t help improve his form even though theirs was on point? If he’s an athlete, probably a lot.
All of life is this way.
There are many who are good at doing a thing, but don’t know how to teach it.
Then there are people like the coach who will never experience the very thing they are great at teaching.
Find the gifted teacher.
Great video on squat technique for taller lifters from Eugen Teo
Only 1 minute long and master class on how to modify your setup