Honestly my impression as a Spanish speaker who mainly moves around the Argentina IT community is that there is barely any written content (except convos on Twitter); maybe it's because it's easier to write in English and aim for the whole world as your audience. It's also very heavily webdev/mobile focused.

I feel like the devs mostly hang out in Twitter and some Discords, and the content is mostly in Youtube or Twitch.

As someone else said I suggest goncy (that's his handle on Twitter), midudev and Brais Moure, those last two are Spanish and the first one is Argentinian, beware of the accents if you are just getting started.