I wouldn't entirely agree with your summary of that post, it seems to me that they're mainly saying that the problematic portrayals of f/f in the media have ruined f/f erotica for them, not that it's an inherently problematic genre. Which I have absolutely no problem with, I'm not wired that way but we all have different squicks and triggers etc. Their final paragraph is troubling though, since there is an unfortunate tendency in certain parts of fandom to go from "objectifying and writing porn about men is empowering" (sure) to "talking about being attracted to women, or writing porn about them, supports the Patriarchy" (noooo)

Personally, as someone who isn't all that much into explicit depictions of any sorts of genitals, this argument doesn't have much to do with me...except for the fact that it doesn't explain why non explicit m/m romance and friendship is more popular than non explicit f/f romance and friendship.