That's my impression. They've moved on from deconditioning and, in some cases, from conscious false illness beliefs. It's now more about subconscious "learned" behaviour, i.e. your brain interprets harmless input as a threat and reacts (subconsciously) with the sickness response. Alternatively it's central sensitisation. Either way, the treatment is CBT or some form of brain training intended to make your brain feel safe, or GET to slowly desensitise your brain from reacting to exercise. So the illness model changes but the treatments remain the same - though they'll get new names no doubt, to make it less obvious.
Needless to say GET and CBT (under whatever new names) still don't work - that we have plenty of evidence for. And that's totally irrespective of whether this new illness model is correct or not. AFAIK there's no actual evidence that it is any more true than the old deconditioning/false illness beliefs model but even if it turns out to be correct, the main point is that GET and CBT still don't work.
Do you think that even though the new NICE guideline sort of gives a backdoor enterence to this, that because the NICE guide also says clearly that exercise and CBT should not be given as curative treatments, that we could then complain if they were given? At the moment, we can't complain because they're "just following guidelines"... and often they seem like nice, just midguided people. But to keep doing GET, even by a different name or underlying theory, it would still be being offered curatively, which would be against the new guideline. Perhaps this, in absense of a yellow card system, is how patients going forward hold people to account?