Pride, and the lack of the right form of it.
Only real scientists manage to change their verdict on something, if the evidence for a conflicting understanding is the best. Bad scientists try to save face.
Gundersen insists that the step-test from PACE showed that GET works, simply because the authors in the answer to Tullers criticism wrote that the GET-group got "significantly better". But this is simply a play with words and language, because this picture says it all.
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But he don`t care about the patients not actually being significantly "significantly better", he cares about everything that backs up his stance, even though it`s a constructed fairy tale that severely harms people`s understandig of what ME/CFS is likely to be.
There`s no point talking to walls, they don`t do research.