Interesting that in the mild to moderate group, 4% of patients found they either became completely well or very much better after GET. That does tie in with the reports we sometimes see on this forum or in newspapers that exercise cured or greatly improved some ME/CFS patients.
4% is also pretty close to the rate of spontaneous remissions in adults.
But I seriously doubt GET has the capability of causing substantial improvement in anyone. If they have ME, it obviously isn't helping at all physically, as has been repeatedly proven in the BPS trials using actometers. And if they don't have ME, tiny incremental increases really aren't necessary, and there's no explanation of the mechanism for such a treatment to improve patients of other diseases.
GET might act as a placebo for some milder ME cases who can (for now) afford to ignore PEM without completely catastrophic consequences. Or it might coincide with independent remission. But even aside from the reported experience of pretty much every ME patient, the research itself has proven that it is ineffective.
Whether or not a maintenance level of exercise is beneficial is a different matter, however. But with even mild ME cases struggling to work full time and having little or nothing left for a social life, it seems rather perverse to push in few minutes of GET or other structured activity per day at the expense of not being able to do some household chores or visit with friends.
I have never seen any case where structured activity made any sense in ME patients. Either people do it and exceed their limitations, and spend a lot of time in misery during crashes, or they cut out essential life activities and pay someone else to do them instead, in order to dutifully go for a walk every day. It's completely irrational, distressingly so. And I can only think that our fatigue psychobabblers and Western society's "exercise cures everything" mentality are to blame for some patients being in such steadfast denial of reality.