The physical description of the Kalay is east-Asian, though this doesn't really get reflected in the art.However, even Thule kinda suffers under unspoken racism. In a setting that is purportedly real world Greenland (however, it's fantasy from just before the last Ice Age), every human civilization on the island save one is white, European. There is one invader group that is black, but, everyone else is European.
Not a single native group to be found. It was something that did stand out to me running the setting.
And, I say this as a huge, gushing fanboy of the setting. It really is fantastic and I love it to pieces. There's a six foot map of Thule hanging above my computer as I type this. So, yeah, the setting is great.
Does that make Thule racist? No, of course not. But, would it have been better for having included a couple of native groups - maybe a mythological Inuit people, perhaps? I think so.
There's no indication of whether the Daray (generic European) Nimothans (Scandinavian) or Kalay(east-Asian) are more or less native, ie who arrived first - the Serpentmen presumably arrived before any of them. The Lomari and Atlanteans are noted as arriving more recently, with the African-descended Lomari the most recent arrivals, as you note.
IRL the Inuit only reached the area very recently, wiping out the Paleo-Eskimos, and possibly
wiping out the Greenland Norse, though the latter is uncertain. Thule is set in a mythical past of
course, but IRL 25,000* years ago most modern population groups didn't exist yet. Caucasians & east-Asians were only starting to diverge as the last Glacial Maximum made central-north Asia uninhabitable.
Anyway my point was that racial conflict in the setting is not Good Race vs Evil Race, and I rather like that. It's also a relatively minor theme compared to typical Tolkienesque Orcs-vs-Elves D&D.
*I settled on 25,000 years ago since that was the last time there was a significant climate cooling so it seemed to make the most sense for when Thule becomes glaciated, 25,000-22,000 years BP. IRL Greenland was last ice-free more like 75,000 years ago, from what I recall, but that seemed too early, while setting it at the end of the last Ice Age ca 12,000 years ago seemed too recent and not fitting the glaciation theme.