I agree with you. We have a more stong Guaraní presence in Bolivia and Paraguay today, about 280 thousand people living in four countries from a study in 2017 [1], which 85 thousand living in Brazil, which is neglegible comparing to the population numbers in that regions.

The reality is that those communities are very poor, having even cases of institutionalized racism, where children were separated from their parents at their Guaraní and Kaiowá communities by the brazilian state and sent to child safety services, atrocious. [2]

[1] https://mobilizacaonacionalindigena.wordpress.com/2017/04/27...

[2] https://cimi.org.br/2018/03/racismo-institucional-justifican...