IMO it's just some dude who wants to make money by attracting desperate-to-seek-a-cure people, like us.
POIS causes can be different in people, IIRC there are like few theories running around and none is better than the other, because THERE ARE different reasons for very similar symptoms. For example some people are allergic or have autoimmune disease to their own sperm, meanwhile I for sure have some hormone imbalance.