Thanks for your responses. First of all, 100% agree that the guy who claims to be cured by abstinence is making several unfounded claims. The video is also a bit bizarre.
I had not seen the other one, Spartak, the one with the candida theory. That guy seems credible to me. It was a bit of an "oh shit" moment for me to be honest, because I've had some symptoms that seem to suggest some kind of fungus based on the little I know about it, notably what seems like oral thrush and some weird stuff coming off my skin, mostly my face. It's not like dead skin, it's not little flakes. I had that really bad in the years after a heavy antibiotic cure about 20 years ago (which I suspect is how I got POIS). At that time my skin was really read and irritated-looking as well, and whatever it was that was coming off it was lighter, almost white. The skin symptoms have calmed down but I still have them a bit.
Has anyone on the forum tried out this guy's proposed cure? (In short, semi-fasting with vegetables, enemas and probiotics.)