Ipf is tge only fed judging squat properly.
The IPF from what i've seen in Australia don't judge by the rules, they expect you to squat atg or its a no lift. Disqualifying a lift that should have been passed and passing a lift that shouldn't are equally bad. The rule on depth is the same in most feds, crease of the hip under top surface of the knee. Harsher is not better.