There is a first for everything. All people basically come from Africa, so what is the cut-off for being native anywhere? Point is they’ve been here a long time, and they’re indigenous. They are not native “Americans”, however.
I agree that American Indians are indigenous although their ancestors came from somewhere else. The question is how long does one’s ancestors have to be here to be considered indigenous? It’s just that the assertion that only they (those alive now) are native is irksome. As for Native Americans, all of us who were born here are native Amerians, or none of us are.