As if being "indigenous" makes them the purest of souls that cannot be corrupted.

Already happened several times, actually.

Just see Operation Nambikwara where 15 leaders collected fees to allow miners and loggers into their territory. Or the case of Chieftain Damião Paridzané from Xavante clan that received nearly a million per month from 'ruralists' and loggers to exploit his clan's land. The Operation Warari Koxi, where the Federal Police found several Yanomami natives working with illegal miners devastating the forest to illegally extract gold from their reservation. The chieftan Darlan Guajajara de Sousa who used his tribe as headquarters for drug traffic... and goes on and on.

These are politicians, being "indigenous" is just a part of their identity. Take that news with a grain of salt and for what it's worth: a publicity stunt.

For my part, what I want to see is the Federal Police going hard against illegal miners, drug dealers and illegal loggers operating in the Amazon region, and increasing spending in satellite and radar monitoring. Furthermore, the very hard conundrum of "how to give opportunities for natives to thrive without destroying their identity and land" needs real solutions.