you have some of a point here, and yeah, for various reasons, including marginalization, its resulting societal standings, and simply the lack of opportunity to industrially fuck up the landscape, indigenous people do in fact tend to end up as better stewards of the land. however, suggesting that this is because they're born special and aren't just following a different culture and incentive structure is a slippery slope that tends to end up in ethnonationalism on the part of whoever colonized a given piece of land first.

colonialism is absolutely a problem to this day, but it's not the only problem there is. while eco-fascism can go to hell, simply opposing it does not automatically clear your ideology of any problems.