My thoughts exactly. Oren's idea is probably even more unlikely than Blanchard's.
The thing about autogynephilia is that it was originally developed from studies of TS although common sense would make me believe that it is more applicable to CDs than TSs. Nevertheless studies have indeed shown that many TS women have eroticised about having a female body so there is a solid foundation on which the theory was developed.
However in the TS community there is a knee-jerk reaction to anyone inferring that there is a sexual component to their behavior. TS are supposed to be at the "serious" end of the TG spectrum where only the emotional/spiritual aspects are to be considered. Linking to sexual motives leaves the TS community open to the charge that they are just CDs who have fooled themselves into chasing the ultimate fantasy. Obviously the TS community is eager to close that door hence the violent reaction to the autogynephilia theory.