Surely, surely, anyone with any moderate hold on reality and the facts of this situation would know that Maya is not ‘denying the existence of’ or ‘seeking to eliminate’ a group of people.
Right, but these people are never talking about reality.
They're always talking about words.
When they say "women" they don't mean actual people, they mean the word.
When they say "some lesbians do dick", they don't mean "some homosexual females", they mean "some people who call themselves lesbians".
Any statement they make is a statement about how they're using the word, not about the actual characteristic of an actual defined group.
So given that, the statement "Maya’s main argument that transgender women are not women is at baseline offensive because it seeks to eliminate the existence of a group of people" makes sense - it's the group that's being eliminated, not the real people. She's denying that "transgender women" exist, because they're men. (Of course, they're just thinking of males. Obviously there are lots of female transgender women).
Now, because they're always thinking of words, what Maya does by denying "transgender women" is worse than saying that "lesbians do dick".
The first is invalidating the "transwomen" group, so is bad. The second is retaining the "lesbian" group, so is fine. It may have redefined individuals, but "lesbians" as a group still exist. The group just isn't made up of homosexual women any more. Indeed, the group is stronger because it's more inclusive. The group has been expanded, not eliminated. Yay!