This is a good answer because it lowkey acknowledges that if there isn't working class organization along indigenous lines there probably won't be the chance for self-determination in a revolutionary moment. These things are materially driven, not morally. There will be many historical wrongs not righted in a revolution just by historical happenstance. I feel like too many people think of communist revolution in idealist terms where it's just the moment where all good things happen. Especially in hypotheticals like this where the revolution magically happens tomorrow.

That said, in a non-magic revolutionary moment it would be almost certain that there would be an organized indigenous faction so I wouldn't doubt the ability of an indigenous worker's party to self-determine. I'd be shocked as shit if there were an organized, revolutionary working class movement in the US that didn't heavily feature organization along ethnic minority lines like the Black Panther Party already attempted