It's a weird ruling. To me it looks like a fix to the problem of trolls attacking DGPT livestream comments and PDGA social media posts since it only applies to those sorts of events. It's really targeted right at Natalie Ryan, which I would think (which is a lot different from knowing since I don't) would help her in a legal case.
In theory it leaves open for females who are transgender to play at lower levels of the sport, but if it was me and I knew I was banned from the highest levels of the sport I'd be gone. Why hang around a sport that wants to hide you? I'd never give an org like the PDGA a dime if I was transgender.
For that matter, why would they define fairness differently based on professional vs amateur status?