Every field has its embarrassing cousin who lives in the proverbial attic. In virology there are scientists who deny the existence of AIDS. There are biologists who deny evolution. There are architects who say 9/11 was a controlled demolition. There are climate scientists who deny climate change. And yes, in the field of political science, there are those who deny Indigenous rights. Most of these "experts" have books and many of them have received a great deal of air time to voice their otherwise marginal perspectives.
When it comes to political science approaches to Indigenous rights, Tom Flanagan and Barry Cooper qualify as perhaps our biggest embarrassments.