I agree that there are orthorexics, but there are plenty of people who are forced to go through a dozen different dietary variations and yet genuinely don't recover (some or all of) their health-problems at all, without any "mind-over-matter" issue being involved. I mean there are genetic illnesses which are clearly incurable, and some peoples' health has been so heavily damaged by their life's experiences re bad diet etc. that no possible diet may be able to get rid of their constipation, say. I know someone, for example, who is c.85 years old, and has a nasty "bend" in his spine, due to former accidents etc., which is impacting his colon, so that he gets chronic constipation. Such a person might well benefit somewhat from diet in other ways, but is unlikely to ever solve his constipation problem via diet(or any other way, given his age).
I personally had to try a dozen different diets before going rawpalaeo, with most of those diets providing either no benefits at all or very few benefits. Only once I went rawpalaeo did most of my health-problems get solved within 4 months, but it took some years to fully solve all issues. I wouldn't be surprised, though, given the vast length of time I had such inflammation etc. etc., that I encountered permanent damage of some sort(for example, I still have some very minor heat-intolerance, though not serious any more). Admittedly, though, I haven't felt the need to drastically change my diet for many years, other than very occasional, very short-term RZC trials or such-like for experimental purposes some years back - I just am trying to say that long length of time on unusual diets does not, by itself, imply orthorexia.
As for Kurt Harris's notions, he is simply trying to pander to the masses, so doesn't dare to be too far off the mainstream SAD diets, yet, at the same time, he needs to be slightly different so as to offer something slightly original and different from pizza/junk-food diets. That way, he keeps attracting more followers.