I think this argument Chivers has published makes it pretty clear that a large part of the problem the individuals who spoke to him complain about is that they are angry that their own research has been judged by NICE as very low quality. That has repercussions for all their research, not just PACE, and not just ME/CFS.
That seems the important point and the reason why the final guidelines should be made public. They will want to dilute the effects of that apparent agreement.