Sign up for and read the whole MaxOT program. Read everything about HST. You should be able to tell which one gives more scientific reasoning for doing what each program is designed to do.
In my opinion, the AST website is great. It is loaded with good information. However, the MAXOT program itself, is flawed. Under MaxOT, they stress that overload builds muscle. They even stress the importance of progressive overload. However, there comes a point where you can only lift so much wt. Then you are no longer progresively overloading the muscle, you are just overloading it. Your muscles adapt and you stop making gains.