@Tal_lula might be able to confirm whether she is happy with this summary but the original post from here (which included the letter) detailed her fuller experience, which notes reasonable indications that the individual she saw was potentially using terms more consistent with 'FND' these days to describe mobility-based symptoms.
Despite demonstrating not understanding the terms/words he was saying eg neuroplasticity
In/for other areas the physio that I saw privately had contacts who were physicians they'd run things by if it flagged. And wouldn't diagnose but would be wary of making sure they were a backstop if it seemed there was something else that might need looking at ie weren't just ploughing on regardless. But of course it is very different to the NHS hierarchy where someone might have been commissioned and that would be answering back or causing problems - I don't know, is it?
None of this of course starts going into the FND type territory, and from what you've described of this person's understanding of that it really is working like a propaganda of this ideology on paper and
who to look out for rather than those who might be likely to get it and spot actual symptoms (like if someone had a back injury that wasn't responding right and might indicate a scan is needed to check for 'other things'). Which underlines why these people shouldn't have this power. Certainly for these things. Even if there might be some who know what they are doing, those who don't aren't self-aware and learn the lingo pretty quickly.
It also sounds like it is operating like that classic switch-and-bait CFS was set up as where it claimed/pretended it was a diagnosis of exclusion (so having it was a last resort after exhaustive testing) but was a first-stop-shop dumping ground to
avoid investigating lots of people who reported often with real pathology. And that diagnosis was effectively used to rewrite history and wipe-out that pathology (even diagnoses, blood tests, biopsies, so not 'symptoms' as pathology) on medical record because it 'didn't chime' with the 'no known pathology'. I think there needs to be a term for this because I see it a bit with the FND (and other) stuff in the stories I read and of course they want to claim 'a positive rule-in' so then overshadow other stuff.