Well, Ray Williams (formerly Rachel) has appeared on a couple of YouTube channels selling the concept of AGP. He talks about his history of fetishistic dressing and says he is happy to have escaped the "gender cult". He also admits he was into pornography which he says seemed to feed his fetishism.I don't find this at all surprising as he isn't the first to do this. The problem is that he uses his own experience to generalize that of others. Can sexual pleasure be a primary motivation for some people? Undoubtedly and I have read testaments to the fact but we need to be careful not to generalize.
Ray seems to have fallen for an error I have seen repeated many times which is to associate the presence of arousal with a theory that says all transitions are motivated by aberrant sexuality. Ergo, sexual arousal equals AGP which is not proven but also not scientifically provable.
I am the first person to caution about sweeping generalizations that say all gender variance equals "trans" which is a conclusion we can make from observing archetypes who sometimes openly discuss their own histories and motivations. People just like Ray.
At the very least let's respect the fact that every story is unique.