This type of CBT may also be used in other chronic conditions and some say they find it very helpful in coming to terms with being chronically ill.
I have done classic CBT, back in the 80s, to try to help cope with my newly diagnosed CFS. I think it was very mildly useful, at least for me. This supportive and coping version might help some patients. The problem is the coercive kind, aimed at increasing activity, has led to trust being broken between the patient and medical communities.