Socially it depends on how well they manage to disguise themselves as male. Being visibly pregnant is a very obvious indicator that a woman who is attempting to present herself as a man is not actually a man.
Who would go to the trouble of transitioning, against the vicious judgement of some people, if not to try to live a more authentic life? I am (visibly) non-binary, and I can tell you, I don’t do this just for the hell of it.
Are you having a nice time repeatedly misgendering one of my trans siblings? I see what you’re doing. A bit of basic social respect costs nothing, you know.
And “visibly” as in I get funny looks and sometimes shouted abuse from passing cars. Is that enough for you?
So is looking unusual in some undefined way is what "visibly non-binary" means? I genuinely do not have any reference point for this description, and certainly couldn't tell if someone is or isn't based on looks.
My male colleague who self-describes with a "non-binary" identity has no obvious visual markers of this.