I'd say he certainly knows what he is talking about, I don't agree with his views (if he himself even does) though because I feel there is more complex relationship between facial appearance and health. Most of the pics of the people he treated look like they have lost horizontal dimension on there faces, in particular the indicator line (whatever it is called) which predicts sleep apnea risk appears to have shortened (a bad thing). It could just be the photos or more to do with the people still having growth remaining at time of treatment, if the later is the case then that growth should have been directed horizontally (if that is possible somehow). Seems he knows what he is doing isn't ideal, but it's the best he knows what to do. That is why he starts pointing movie stars with flat faces and asking the question well who says it is bad to have a flat face.
This is just my 2 cents I don't know jack and no doubt missed a boat load but just a got nothing else to do, mums basement is a boring place to be.
