This fact could be useful perhaps if it seems that the UK is all on it's own in presenting the idea in the way they do.
I found the web page that shows the history of the Department of Work and Pensions' development of this idea, with all the relevant links to their commissioned research and 'evidence':
https://www.gov.uk/government/collections/health-work-and-wellbeing-evidence-and-research
It is definitely about reducing government expediture on working age sickness benefits. The UK may be alone in promoting this concept because so few people in the UK have private disablity and sickness insurance, and when they do it is often time-limited (e.g. for 1-5 years maximum payout rather than giving them a permanent disability pension).
It is relevant to us (as PWME) because this underlying agenda is one of the reasons for the implementation of the original IAPT programme and the more recent IAPT for Long Term Conditions and Medically Unexplained Symptoms. The fact that the latter includes CFS/ME is strong evidence that the DWP includes our condition as a 'common health condition' (because the symptoms we have include 'chronic fatigue' and 'musculoskeletal pain', as well it being believed that anxiety and depression are also common in CFS).
So I think it will be essential for the revised NICE guidelines to stipulate the nature of 'post exertional maiaise', explain clearly that we have a 'broken energy production system' and that even the most limited exertion can be dangerous to a person with ME (or 'CFS/ME'). Otherwise, it will be assumed by any health care professional that some work (even if a only small amount) will be good for the CFS/ME patient/benefit claimant they are assessing. In other words, it will not be accepted that being expected to engage in 'work-related activity', or possibly even in 'work' as paid employment, could pose a 'serious risk to the claimant's health'. It's also another reason why we desperately need CBT as well as GET removed as treatments or management in the NICE guidance and any other NHS information or training material.
Edit: It is also important that the revised NICE guidelines point out that ME can cause
severe cognitive difficulties and cognitive exertion
alone can induce severe PEM, as otherwise it will be assumed that PWME can do non-physical 'desk-based' work and work-related activities.