I'm now highly doubtful of Inca being in, and seeing Siam as more confirmed. One article mentioned raising the dead Aztec language for Montezuma. They mention Civ and Leader by name. The other article just used the language name.
The article talked about Quechua, people, the language of the Inca! Also, no one knows what Quechua under the Incas was like, seeing as Quechua has 3 languages that are barely intelligable to each other nowadays, so what Fireaxis may have to do with Quechua is either blend, do a lot of guessing, or use one of the 3 Quechua tongues(North, Central, South, esssentially, with South being predominant), or even more so, resurrect a dead dialect.
