What the map of the world looked like before the rise of imperial states although a lot of groups are obviously missing as this is a map of the groups that survive to the present. My vision of the future is a world of millions of micro-cultures, ranging from reclaimed ancient identities to newly invented ones spread across all continents, with colonies in the Arctic, in the subterranean, on the oceans, and in space.
Indigenous European Peoples seem to be missing on this map.
I think the map is supposed to be of groups that currently exist or which are formally recognized as indigenous today. I find that regrettable as well because there are a lot of other groups that could reasonably be considered indigenous, past or present, including many with European origins. https://en.wikipedia.org/wiki/Ethnic_groups_in_Europe