I appreciate the effort and think it's a good idea in that it tries to help people remember that this wasn't a barren empty land before European settlers arrived.

That said, I think the NPR article overstates the quality of the map. I can't speak with any authority about any Native American tribes outside the upper Great Lakes, but the map understates the extent of both the Odawa and Potawatomi tribes, and fails to recognize the relationship among those tribes by, e.g., failing to list the Odawa name for the Odawa (Nishnaabeg), which would clearly mark them as closely related ethnolinguistically to the Ojibwe.