Cause those are ****ing monsters who have being doing olympic style weghtlifting all their life especially reza.
Look i aint here to talk shit or who is right or not but in every 101 squat technique they will say keep you knees where your toes are.
Im not trying to offend you or anything.
Variation of the squat named Sissy squat implies you go over the toes.
When i finished kinesiology i was taught that way.Im always looking ways to improve and expand my kowledge and will surely check this out what you say.