I guess this is in part what makes this thread interesting to me. That things about strangers that to me are trivially unimportant matter so much to some other people. And that there are people in this world who think that what is important to them should be important to everyone.
The Australian singer/songwriter
G Flip identifies as nonbinary. In the hypothetical situation where you might be discussing G Flip's music with someone else, what pronouns would you use?
If you know about G Flip and their music, you probably know what pronouns they use. You don't have to know them
personally. But as a fan of their music, it's one of many things that you might find out about them. An aspect of their character, their personality, like the fact that they're from Melbourne, or that they premiered their first track on Triple J in 2018. One of those little facts that you happen to know about someone. I'll bet there are people that you know some things about, despite not knowing them personally. This is just another of those.
Are the Gender Gendarmes going to break down your door and haul you off to Gender Gaol if you get it wrong? No. But that's no reason to be inaccurate.
I picked this one example out of
Wikipedia's big list of nonbinary celebrities because they happen to be Australian. I'm not familiar with their music (but perhaps I should be). I could have picked any one of plenty of others.
And, just as an aside, I used the singular they/them pronoun several times in the paragraph above, and at no time was it unclear who I was referring to. So there's
that argument dealt with too.