The idea that disclosing pronouns should be normalized even for cis people is a pretty established part of trans politics. The idea is to shift the norm away from trying to guess people’s pronouns based on the way they present, and just make it normal not to assume.

Even when someone is doing so for allegedly “the wrong reasons” like they’re just trying to do the fashionable thing, they still contribute to establishing a new norm that harms trans people a bit less.

I get what you’re getting at with people fashionably assigning symbols to themselves to make themselves look more radical but I don’t think pronouns in bios should be lumped in with that.