Probably true - but having a great many soldiers in an area where there are an extremely isolated people such as the "uncontacted" Yanomami also poses its own risks. If they're focusing on the most sensitive areas with highly trained personnel and making use of the impressive knowledge and expertise in Brazil's Indian affairs department, FUNAI, much could be achieved. The situation in French Guiana is quite different, with perhaps only small numbers of Wayãpi living in isolation.

Brazil is rolling back the free-for-all that was established under Bolsonaro, but if they're handling it delicately, that's likely good news.