Why do you say that? Wait, I'll start a new thread on it and look for topics here that may have already been started.
The methods he uses can be dangerous if someone tries to use them first of all. Alpha rolls are a pretty sure fire way to get you bit if you use them with the "right" dog.
Also using his methods on some dogs may give the appearance of improvement…but cowing the dog is not actual training.
If you use some of the training he uses on a fearful dog you are going to teach that animal exactly the wrong thing...