That's all you have?Ok, bolding the sentence wasn't enough, let me isolate it for you:
The tribunal suggested that an employer could make this policy. They're not requiring it. There's no compelled speech here.
... if the employer chose to make this their policy, which they're not compelled to do.So the compelled speech would be that others are compelled to address the offended team member using the personal pronoun of the offended member's choice.
... so it would be "compelled speech" in the same sense that when I worked in retail, I was "compelled" to say hello to customers when they walked into my area.