The movement isn’t saying that every precolonial society was better than ours in every metric, or that we should roll back the clock a thousand years, all it’s saying is that we should work towards giving back what was lost through the countless genocidal policies and violent colonialism that indigenous people across the world have faced.
Also I will say, at least in North America, which I’m most knowledgeable of, many indigenous societies were absolutely far more egalitarian and democratic than most western democracies, but are painted in a far different light when reading of them from the colonial perspective.