[Svartalfiar]

But the idea that anyone can change their biological sex is contrary to Catholic belief.

Is it though? I'm not the best rehearsed in the myriad of Church documents, but I kinda doubt that's something that's mentioned. It's like saying Catholics don't believe two plus three is seven. Math and biological fact aren't really areas that religions tend to bother having beliefs in. Facts are facts. No belief is necessary.

[fidelis]

The last three Popes have made it a point to condemn “gender ideology”.