My biggest problem with this theory is that there is no solid taxonomy you can point to other than saying “His galea is big and wide” or “He has poor cranial and facial structure.” Maybe the methodology is incomplete, but as an onlooker, I don’t know what that’s supposed to mean. You guys seem to have a taxonomy you agree on, but I just don’t follow or see the distinctions you’re talking about when you post examples.
That said, there is plenty you could point to to say that scalp tension and poor blood flow plays a big part in hair loss. Treatments like microneedling and vasodilators obviously work for a reason.