Perused it - in spite of his protestations, it is another variation of in your head / past trauma memories:
"...What spectrum of symptoms will be provoked in this way? This will be individually completely different. Because that depends on the kinds of aversive memories the affected person carries..."
I don't think that's true. If you take LSD or any other psychotropic drug, you will experience a range of, well, sensations, that are entirely made up from your own mind. Yet the reason is clearly physiological.
In fact, I think it's likely that psychiatric disorders are a lot more rooted in physical reasons than psychiatrists think. If you compare our brain to a computer, depression is not a bug in the program (the software) but a hardware issue. And our brain (the software) is smart enough to adapt itself to a faulty equipment, but may show a few glitches. We can often fix severe depressions with diet and supplements, more efficient than years of psychotherapy. How does that fit the theory that our software is buggy? Psychatrists just look at one side of the puzzle. They try to tweak the software (enable our brain to work around faulty hardware even better) instead of fixing the hardware. They never look for a physical cause for an illness. One reason why I strongly dislike psychiatrists.
I'm not convinced of his idea for quite another reason. I believe that ME/CFS is a modern disease, because we have no old records of mysteric fatigues beyond 100 years. There may have been a few isolated cases, sure, but I don't think it had a high prevalence. A disease like diabetes was very rare too 150 years ago (maybe 1 in 1000), rarer than ME/CFS today, yet it was well known and described. So whatever causes ME/CFS, either it's a new virus/pathogen (like AIDS) or the western environment (diet, toxins) seems to cause it or make it a few orders of magnitude more likely, or both. I don't see where that fits into his theory.
Another reason is that his theory needs to explain how the historical outbreaks happened. He says a person gets ill if the sum of averse memories pass a threshold. But since we had outbreaks that followed the pattern of an infectious disease, there has to be an external trigger. Most outbreaks happened to people after vaccinations (AFAIK), would a weakened immune system be enough to "push people over the cliff"?
I still find it intriguing to think about unconventional ideas, and he may be on to something. Maybe he's on track why we have these highly individual symptoms, but has the wrong trigger. Who knows?