The article is about discrimination and coercion, not the natural ebb and flow of languages and cultures. If you haven't had a chance to read it, it's probably a good time to do so if you want to discuss what's actually in it.
And this thread is about a small part of the topic. We don't need special designations or considerations to combat discrimination. I am also calling into the question the entire notion of indigenous people -- considering that many of groups in question have lived on the same land for 100s of years. I also call into question the notion that your (as in you/me/anybody) ancestors have any tangible relation to today. In such, that, we grant a clean slate to EVERYBODY when they are born, and judge and treat them only on their merit.
In short, your ancestors accomplishments/failures or sins matter not, for you are a new person.