That isn't really an entirely accurate description of Blanchard's research on AGP, if people are going to use the categories defined by him, use them, but he doesn't say that men with AGP are all walking around dressed as women to get a sexual thrill.
He says that men with autogynephilia have a 'target location error', where they are in sexual thrall to the idea of themselves as a woman. AGP is a paraphilia. Well documented, and talked about by men who have it from one end of the Internet to the other.
Of course, Ray Blanchard is no feminist quite clearly has a certain amount of sympathy for men with AGP.
I, on the other hand, reserve my sympathy for their wives and families whose harrowing experiences can be read on Trans Widows Voices and Children of Transitioners.