Taking a minute to read the article but want to reply to this first:
Using "x" is garbo and ableist since it fuck ups with text to speech software - and just is hard/weird to vocalize in general, which, in itself is an issue since it makes people write it but not say it. What (some) the portuguese speaking community tries to do is use "e" (or "i") instead.
An old article on the issue (in portuguese):
https://identidades.wikia.org/pt-br/wiki/Deixando_o_X_para_trás_na_linguagem_neutra_de_gênero
But anyway, my biggest issue with the "latinx" term (not the use of "x" or neutral language), is that it's a term birthed from the USA to identify the entirety of latin america. And that's not where the "name" of our identity should come from. That's just neoimperialism shit, well intentioned or not. Give us our time and let us form our own shit.
A few feminist movement groups also have an issue with it since it took a fucking lot of effort for "latina" to even be used in a lot of places.
It's a mess and one that the USA should not be poking its nose at. It's not their issue.