It may not be able to be removed but it can still be ignored, overruled, or made irrelevant by any number of bureaucratic hurdles and chicanery thrown at it by future conservative/liberal governments.

Imo a better (non-liberal) solution would have been to construct something like the USSR's Soviet of Nationalities where all the indigenous nations would get not just a "voice" but constitutionally guaranteed representation and the ability to advance/protect indigenous interest with real influence in the legislative process, including veto powers.