It is simply a matter of too much to respond to adequately.
I also believe this is the case. As a matter of policy, a body that issues a draft cannot really completely undo the draft just like that without causing incredible problems for itself. It would be a reputational disaster for NICE to decide, after producing a draft based on a thorough evidence review, that it was all a mistake and that CBT and GET are now fine. If that's the case, it would really require an entirely new process because it would essentially be a completely different guidance. As an organizational matter, NICE would have an impossible time explaining that and retaining any credibility. At some point, NICE's own institutional instinct not to completely undermine its own processes and appear to be buckling under outside pressure should kick in, if it hasn't already. I wouldn't be at all surprised at wording changes around the edges that make it easier for CBT and exercise people to offer something that would appear to be in line with the guidance.