There is really no point in arguing gender or lack there of between players. That's none of our business, honestly. What we should be arguing is that a fantasy game has no need for identity politics. Eorzea appears to have two genders. If that is unacceptable, play a different game.

I don't even feel comfortable assuming every player who considers themselves non-binary even cares what gender options are in this game. It's a character not an extension of the psyche.