I remember reading those pages, too, on acne.org. It was surprising to read that diet was brushed off so easily, and Dan himself has stated that he gave up milk, saw himself getting clear, but attributed this to being malnourished in regards to calories.
It's a sad reality that money IS the motivating factor in most pharmaceuticals. There is no money in promoting natural, diet-related remedies. Right before I found out about giving up milk, I was prescribed accutane. I was told my acne was "all over my cheeks" and was moderate. You can see for yourself on my log that this was not the case. The doc was literally handing out prescriptions of accutane like it was no big deal. Luckily I did my research and decided to take a more holistic approach to acne.
Low and behold, after reading for years diet is not related to acne, I decided, wtf, I am going to try it. And voila, months of clear skin. Showing that the statement by Dan that diet has little to no effect on skin and that BP will take care of any issues with diet is kind of garbage. Sure, I was decently clear just with BP, but I still would get breakouts and pimples here and there, diet was the missing link!