What? No. This is surely (obviously archaeology has just begun, so nothing firm yet) a Mayan site, as it's smack in the middle of the Mayan homeland. The classic Maya were a big, elaborate urban civilization with recorded writings and easily the best understanding of mathematics among known pre-iron peoples. This has been attested by literally dozens of sites across the past century. We've even translated their written language.

The news here isn't the discovery of some new civilation, it's the discovery of a hopefully-undisturbed Mayan site. The others were "abandoned" but still largely plundered, leaving only the big stone monuments undisturbed.