They use the term because they don't want to say "woman," but by saying that a woman is defined by a uterus, they are illegitimising every woman who has had theirs removed or was born with a defect. "Whoops, you got cancer and lost your Uterus. Sorry, you're not a woman anymore, now you're a person without a uterus." I love watching how their ever-more "inclusive" language excludes, not just people in general, but the overwhelming majority. When the normies finally crack it will be beautiful to watch.