the squat is naturally quad dominant and most people have naturaly week hanstrings so there is no need to further overload the quads. In addition if he has you squat with the board every time (I bet he does) you claf, hamstring and lower back flexibility is going to go to shit and will eventualy lead to postural problems with the spine and pelvis.
Also tell him to do some research of his own on the benefits of the deep squat instead of hearing something and taking it as true. There is no evidence that proper deep squatting increases torque on the knee and plenty of evidence that shows that the load is transfered to the hips reducing torque at the knee seen in parallel or slightly above parallel squats.
Also tell him to do some research of his own on the benefits of the deep squat instead of hearing something and taking it as true. There is no evidence that proper deep squatting increases torque on the knee and plenty of evidence that shows that the load is transfered to the hips reducing torque at the knee seen in parallel or slightly above parallel squats.

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