The debate around terminology for spaces intended for women (and the tendency for folks to make nebulous assertions about the inclusion of NBs) seems to me to be an entirely separate issue.
Fundamentally, I see what you're saying but I'd like to push back on the idea that the term "feminism" needs rethinking at this point in time.
I'd even go so far as to say the parent comment where a rejection of the term feminism is portrayed as tantamount to "all lives matter" is more correct than the idea that "feminism" is a poor term because it feels like misgendering. This is a space centered around the idea that feminism is good for men because feminism is not a term that should leave you feeling gendered in it's primary usage.