This is verifiable from statements of psychologists but also blanchards work itself, within his work it is described that HSTS want to transition for reasons due to external perception, to get with straight men, this would be and extrinsic influence. On the other hand, AGP is described as being internally motivated even if just for a fetish, this would make it an intrinsic sense of womanhood.
If HSTS can't exist without society, and AGP would want to be women regardless due to intrinsic motivation, in what way would HSTS be remotely trutrans? AGP are the only ones with an internal sense of womanhood and again according to blanchard himself the only ones who would experience true gender dysphoria in the way we define it now.