It is true that autogynephiles have a tendency to date trans women. However, this is not what I am talking about when I am talking about homosexual autogynephiles. I am talking about autogynephiles who are attracted to ordinary masculine men. For instance I know an autogynephilic transsexual who got married to a man before she transitioned.
Anyway, addressing this:
Transsexuals end up with other transsexuals of the same biological sex at a much higher rate than do regular males or females.
Autogynephiles’ tendency to date trans women exists before they transition; there’s a whole stereotype of “trans chasers” who eventually transition, and if you ask people whether they are attracted to trans people, then autogynephilic cis men are much more likely to answer yes, and if you measure erections while showing different kinds of pornography, then autogynephilic men are much more likely to get erections to porn depicting trans women.
So autogynephiles date trans women because they are much more likely to be attracted to trans women. Not due to “their high levels of eroticism and inability to find suitable female partners”, or “their desire to be with a woman, but being unable to do so”.
So observing autogenyphiles getting into gay relationships doesn’t need to imply an inherent attraction to men, which cuts against the idea of autogenyphilia.
If autogynephilia definitionally needs to be an inverted form of gynephilia, then diagnosing autogynephilia becomes a difficult causal inference problem, and there is little-to-no evidence of its existence. In practice people do talk about autogynephilia without worrying about this, and from this we can infer that attraction to men does not cut against the idea of autogynephilia.