The evidence from trials is now clear - that however valid any of the BPS speculation might be, the treatments are not cost effective and probably do not work. Specifically, they refute the BPS theory, in that even where there is reported symptomatic improvement, function does not improve - i.e. the patients' disability is not due to their perceptions of symptoms.
Maybe the right angle here would be the scandalous grand promises as such. It was sold as a panacea, fully effective, cost-effective, literally sounded too good to be true. And it's a complete dud. Billions were wasted, millions (counting elsewhere around the world) were experimented on. They promised the Moon, and still can't even deliver a pebble.
If there is to be a working angle here I'd say it's this one. There never was any actual promise for this treatment model, it was all a lie. People don't like being lied to, especially when it costs them money. And the lies, and the losses, will continue until they are brought to light. At this point with Long Covid it's affecting the broader economy and so the lies are especially visible. If their stuff worked, if as promised it's not the physiology of infections but the behavioral response to it, there wouldn't even be any of the major rises in illness, morbidity and other issues we are seeing from COVID. The truth is that infections, even mild ones, can have huge consequences on health, independent of acute injury. This is the truth that this egregious lie covered up.
Regardless of the nature of the illness, or what they believe about it, they sold this pseudoscience without any actual evidence. The only angle perhaps they'd have is that they never said anything about a cure, since they don't even believe there's anything wrong. But this is what they sold nonetheless, as part of the Big Lie was their infinite belief that there is indeed literally nothing physiologically wrong to chronic illness.
Edit: on the issue of a "cure", actually the mewling over removing exactly that language in the NICE guidelines makes it official, that they really always meant it to be a cure, but facts would have to matter here for this to be significant