That's because the Supreme Court's job is statutory interpretation, not making political statements. But given that it's such a politically divisive topic, I think it's clear they felt the need to remind readers of the FWS judgment that it's about the former and not the latter, and that it should be considered in this framing.

That it also happens to be a major and very welcome win for women's rights is orthogonal to the intentions of the UKSC.