I'm very doubtful about the presented figures there. The author clearly has an agenda and does not present any sources. Additionally it is completely missing ReLEx/KLEx (SMILE etc) methods which afaik are pretty popular.

I wonder how much of that is PRK vs. ASA?

It seems that ASA is a wide term for methods of moving the epithelium and replacing it after the procedure. I had this with one of my treatments. It is far more pleasant. It makes sense that it is growing in popularity.