I understand from a comment on Twix that he represented himself.
If he does want to go for appeal, I hope he consults a good lawyer who can assess the likelihood of success.
There might be a case to be made to say that the request even being made put him in a difficult position and that being allowed to have pronouns vs being allowed to have nothing is not a reasonable position and therefore, that if pronouns are to be allowed and indeed encouraged, that reasonable protest should also be allowed.
I don’t like these cases that are being brought (mostly by men, it appears) where someone has done something that even many of us would regard as provacative. Without representation, it is impossible to say whether they might have won if their case had been presented differently. It may also be that any decent lawyer would have advised them not to go ahead.
As it stands, it adds to the transactivists’ claims that misgendering and other such activities are outlawed/illegal. That’s a claim they have been making since Forstater and unfortunately, it has not been properly examined in a court case.
The case of a polite women, who has misgendered for good reasons or used pronouns in signature as an objection, but carefully staying professional (arguably XYGuy or whatever he wrote sounds tongue in cheek to me) brought by a good legal representative would be a much better test case.