This isn't a transfem community, nor a transfem enby-excluding community, afaik. There is a transfem community on Lemmy, but it's explicitly inclusive of enbies, so still not just a women's space.
And it's connected to the whole rest of the Fediverse, which is certainly not a women-only space. Things you post here will be seen outside the context of this magazine.
Enby is an umbrella term that can includes people who are transmasc (ie: demiboys, libramascs), transfems (ie: demigirls, librafems), multigender, agender, genderfluid, and xenogenders. Transfem just describes the direction of transition and is not just limited to binary trans women.
Male and female are mutually exclusive, people can't be both male and female, that is asinine. They must be one or the other or neither, can't be both, womanhood and manhood is mutually exclusive.
Do you have any reason to believe that, other than your intuition? Plenty of aspects of reality are unintuitive, and people, in my experience, can be even less intuitive than quantum mechanics. As non-binary identities go, bigender isn't a contested one.
Fem and woman aren't synonyms. How else would you describe someone who was AMAB but is librafem, isn't a woman and even further from being a man, but still has a connection to femininity?
Lots of transfem people are women, but its sorta like a rectangle and square (all squares are rectangles, but only some rectangles are squares). Practically all trans woman are transfem, but not all transfem people are women.
A feminine gender identity is equivalent to womanhood. People who identify as feminine are also women to some extent even if they don't call themselves women, this is especially true for trans women who are in-denial of their transness (i.e. people who claim to be femboys yet want boobs and pretty faces).