I would not consider this to be a potluck. I've been to many parties in both LATAM and the US. LATAM parties are indeed just like US parties very often but in many cases they are much more "communal" without being a potluck per-se. A potluck is still too formal a name for what I've experienced at least. Someone's uncle will bring a piñata, someone's aunt will cook pozole, a cousin will bring a speaker, and so on. And these types of parties are not "uncool" or even "laidback" they can be wild.

For me in the US, potluck describes the style of food and culinary expectation of guests. The actual gathering could be fun and wild if it’s a fun and wild family potluck or uncool and lame if it’s an elementary school fundraiser potluck.