Fionne has a theory that even HSTS have a kind of autogynephila anyway (falling in love with the idea of themselves as women).
I believe a Blanchard confirmed that actually.
That both kinds were sexually motivated.
So HSTS were still sexually motivated, but in a slightly different way, in that they wanted to attract straight men. So less about how they present, and more about how to get who they want by the way they present.
I can think of at least two prominent transactivists who are like this. And very insistent that the men they are interested in/attract, are straight.
Blanchard could probably do with another 20 years of study, to be honest. Since there are so many transwomen now, his typology probably needs a lot of tweaking.