From the same wiki:

> Despite the increase in awareness, use of the term to describe oneself has not greatly increased over time.[4] As of 2018, use of the term Latinx was limited nearly exclusively to the United States.[29] Manuel Vargas writes that people from Latin America ordinarily would not think of themselves using the term unless they reside in the United States.[29]

Maybe it didn't technically originate in privileged English speakers but it certainly seems to have arisen in popularity among them.

As someone who lives in a 99% hispanic region in the US, I've never heard anyone use this term to identify themselves. We're right on the border and that sort of thing seems to mainly happen in larger cities north of here.