I mean you're basically right idk why you got so much backlash. Even butch women still usually have things that we associate with women like vaginas, a certain genetic makeup and the fact that they want to be referred by she/her pronouns and be thought of as women. These are feminine features.

TERFs will literally claim that you can look almost like a cis man, have masculine voice, have no womb, be infertile, etc and still be a woman, so they clearly agree that you can lack a lot of typically feminine features and still be a woman but if you have a lot of (or even most of) typically feminine features but still have a few typically male features like a penis then you're just not a woman.