If I remember correctly the term "sapphic" can be used to refer to same-sex attraction between women in general (meaning that both homosexual and bisexual women would fall in this category) and it's a term that has come to be used a lot in the LGBTBBQ community to virtue-signal in the same way that "WLW" is. Either way, it's pretty clear that they don't want any bisexual men to worship them to the same extent because the overwhelming majority of troons are heterosexual AGPs.
Edit: I found the Facebook page which the second meme originated from, and their definition of "sapphic" (plus a whole bunch of other words) is
slightly more complicated (read: exceptional):
https://www.facebook.com/bambisandtribades/posts/1097086967133728
View attachment 732971