Yeah, as I say in my above comment relying to sofodeas:

Yeah sorry, I didn’t mean to tacitly defer to whatever institution claims to decide what is or isn’t “correct” according to the language. That was a poor word choice. A better way of phrasing my question would have been: is that already a well established convention?

Part of the reason I ask is that from the first time I encountered it, “latinx” kind of struck me as a silly thing that some white Americans might come up with without realizing that a convention for referring to people in a way that indicated their Latin-American ethnicity while remaining gender neutral already existed. Though I don’t know the history behind the “latinx” convention, so I could easily be dead wrong.