Certainly it is a definition. Those guys often say they treat things. I simply do not agree. I think it is something they use to puff themselves up and to make them sound more important and scientific than they actually are.
Penicillin will work whether I like it or believe in it. Therapy, it seems from what others here say and what those guys write, does not. I do not believe therapy should be put in with a medical model. Even some of those therapists do not.