The UK Supreme Court ruling went out of its way to say that it wasn't vindicating any such position, saying:

  It is not the role of the court to adjudicate on the arguments in the public domain on the meaning of gender or sex, nor is it to define the meaning of the word “woman” other than when it is used in the provisions of the EA 2010. It has a more limited role which does not involve making policy. The principal question which the court addresses on this appeal is the meaning of the words which Parliament has used in the EA 2010 in legislating to protect women and members of the trans community against discrimination. Our task is to see if those words can bear a coherent and predictable meaning within the EA 2010 consistently with the Gender Recognition Act 2004 (“the GRA 2004”). (Para 2)

  The court also concluded that a biological sex interpretation would not have the effect of disadvantaging or removing protections from trans people. This is because, in addition to protection based on the protected characteristic of gender reassignment, they would also be protected from discrimination based on being perceived as or associated with a sex which differed from their biological sex (paras 249-261).

Unfortunately, it was taken as vindication of the anti-trans position by all public commentators regardless of the commentators themselves were pro or anti.