German YT video on the squat: how is his form?

Hey guys,

I hope this is the right board section for this question. Please have a look at the following video: YouTube (just go to 9:28)

He explains the (SS) squat very detailed (often citing the book) and the the viewer reception is obviously pretty well. However, I have a feeling that his form might not be that perfect because he doesn't bend at the hips and the legs simultaneously. When I did that, Pete Troupos said exactly that: Bend at the hips and legs simultaneously. It also seems weird to me that his legs and butt move forward at the bottom.

What do you say about that?

Thanks in advance.

He needs a coach. You know what to help him with.