I'm not sure I agree with the premise of this. Its approaching it as if it is psychological. We have already seen studies that have shown conditions like this such as ME/CFS and long covid have a physiological component to them.

Any positive result of this is likely because of either more exposure to the outside world which could fit in with pacing, or patients feeling happier and the pain, fatigue feeling less of a burden.

It would be nice if they spent more studies testing approaches based on actual conditions rather than reapplying silver bullets to everything. CBT is a useful psychological treatment, but physiological conditions need a physiological approach.

Edit: imagine applying CBT with cancer and patients feeling happier and less pain. It doesn't mean it treated the condition, it treated symptoms or emotions. These approaches feel like a joke.