even with the right mats there is equipment that wont take dropping, even just from lock out position, for very long until it breaks. so he might be right.
certainly no power room though.
he doesn't stomp, thats for sure...
http://youtube.com/watch?v=fGESkE-GzUE
however in order to get that full extension in the learning process coaches might recommend the stomping/jumping so that the trainee makes sure he gets the full extension.