Regarding the point the OP makes about femininity, we can assess the observation that HSTS would tend to be more feminine than AGPTS in the context of the HSTS being a manifestation of homosexual male sexuality and AGPTS being a manifestation of heterosexual male sexuality. Again, the argument being made is not essentialist as a particular type of behaviour is not being imputed on males generally, rather we are saying 'males who are *sexual exhibit the following traits...'.
To suggest this was essentialist would be like (for example) saying 'it is essentialist for heterosexual men to be sexually and romantically attracted to women' which is clearly nonsense: it would be essentialist to suggest the general case that 'men are attracted to women', see what I am getting at?
Likewise, it is not essentialist to say 'lesbians are females who are sexually and romantically attracted to other females', it's just a defining characteristic of what it is to be a homosexual female. An essentialist counterpart would be to suggest 'all lesbians are masculine women with buzzcuts who wear khaki and smoke cigars', the imputed trait is not part of the defining characteristic.