The best take I heard on it is that Blanchard's typologies were created in the late 80s. His typologies do have some nuance (e.g. observing some HSTS exhibit AGP traits, or "partial anatomical AGP" can manifest in wanting to be a dickgirl or a futa), but can't accommodate people like Rioley because people like Rioley didn't exist then.
Back then there was no way for the intense mishmash of unlimited access to porn (and being casually exposed to the weird shit in a couple of clicks), the internet facilitating the
Toaster Fucker Problem, the fallout from 2010s SJW rhetoric placing trans women at the top of the inverted pyramid, autistic kids latching onto anime and a massive increase in failure to launch creating the terminally online who end up with thousands of fans in their own little Internet bubbles.
If Rioley had been around back then, he probably would still roughly be like Brett was a decade ago - just some nerdy gay guy in a hippy band (unclear if the anger issues would have still emerged). Instead he's scrabbling around in the dirt with his legs tied together, upskirting people with his diaper in schoolgirl skirt, yelling about how he sucks dick for cock while a man dressed in an elephant costume looks despairingly on. I'd agree with others that at this point his sexuality is pretty much impossible to label as "gay guy with weird fetishes" or "straight guy with weird fetishes" because it's all just the weird fetishes. Everything's either autoerotic or built on deeply recursive fantasies about things that don't exist.
Like it's easier to say Chris is an incredibly fucked up autistic straight man than it is to try and label Rioley.