This definition of compelled speech is inherently politicizing an apolitical thing. I find it super strange to refer to using someone's gender as compelled speech. Sometimes I mistake a man for a woman, especially long-haired men from behind, and if the man corrects me and asks me to refer to him as a man, I don't throw a fit that my civil liberties are being violated. Certainly if I kept insisting on calling my male student she/her pronouns in kindergarten because he happened to have long hair and I got in trouble for it, this isn't compelling my speech any more than if I got in trouble for refusing to use "John" if a co-worker says "Hey don't call me Jonathan please, I go by John". I don't see why we should hold trans or nonbinary people to a standard we don't hold everyone else: if I call someone P and they correct me and ask me to call them Q, I don't think it's compelled speech.