As a woman in STEM, I'd say being a woman in science is always both about the science, and about the sexual politics of being a woman in science - you can't pretend it isn't.
Interestingly, these women are all the same age as me, give or take a year or so. So they, like me, will have grown up in an environment where there were huge barriers to them becoming scientists because they were women. In my opinion, we absolutely should celebrate the fact that this is the first all-women award of a Nobel prize.
Talk about their science, and talk about their achievement. Because in the words of the famous quote "they were doing it backwards, in heels." We need to acknowledge this. Otherwise we're doing the sexism equivalent of those well meaning but tone deaf white people saying "of course, I don't even see colour."