Yes, I think that's the point. Nobody denies that autogynaephilia exists. Blanchard coined the term, but only to replace an earlier term he thought was a bit demeaning or needlessly negative. Automono-something-or-other. Plenty men achnowledge that they have it. Plenty transwomen acknowledge that this is at the root of their drive to become women. Many, many women have distressing accounts of their partner's autogynaephilia.
The apparently contentious part of Blanchard's hypothesis - which as Myriad said, dates back to the 1980s and would not be expected to be complete and immune from modification - is that almost all MtF trans people fit into one of two categories, of which AGP is one. There seems to be little or no controversy over the other category, homosexual transsexuals, who are very effeminate homosexual males who usually grew up as very effeminate little boys. It's the other category, the men who grew up as boyish boys but some time after puberty - sometimes a very long time after puberty, also after marriage and children and a masculine career, often in the armed forces - decide to transition, which is contentious.
Some of these men are autgynaephiles, without any doubt. Blanchard, who spent a career studying this, says he can count on the fingers of one hand the number of post-puberty-presenting trans-identifying males he has encountered who are not autogynaephiles. (He also says there's a lot of denial going on in many of these patients.) The question seems to be, is he wrong about that? Is there another, substantial, group of trans-identifying men who are neither HSTS nor AGP?
Blanchard, although retired, still keeps up with his subject and still maintains that he has seen no credible evidence to that effect. The trans activist lobby disagrees, and has put considerable effort into trying to discredit Blanchard. However, their efforts are propaganda and not science. They concentrate on trying to deny that AGP is a thing, or that it's involved in trans-identifying behaviour at all. What they have never done is to present credible evidence for the existence of this third group, and a scientific hypothesis about what's going on psychologically if it's not AGP.