I too am incensed that the law is being changed to accommodate a sexual fetish, and an extremely misogynistic one at that.
The idea that AGP does not exist is quite simply gaslighting. The most cursory look at freely, widely available online pornography indicates that a very considerable number of men must be interested in this kind of thing.
I have some personal experience of AGP. In my volunteering role I occasionally have contact with men who, abusing the service we provide, take the opportunity of describing to me their fantasies of being made to live as women, dress in exaggeratedly feminine ways and submit to powerful men in various humiliating scenarios.
It seems that for these men, the buzz is twofold: there's all the forced femininization stuff, but the added frission is compelling a female stranger (me, or other female volunteers) to engage with them in a quasi-sexual way, against their will and when they clearly are not enjoying it. I believe that boundary violation is a key part of this disorder.