Modern science is struggling to understand the benefits of the traditional land management practices of the Pemón. Certainly, it's possible that living off the land locally using habitat burns could create unintended consequences in times of drought. However, one needs to look at the real problem -- how lands and peoples around them have dramatically changed through disrespect for the land and its natural cycles. And one needs to respect their long-term success in surviving in that place, and, rather than change the way native peoples live, work to restore the resilience of surrounding lands.
The other problem you will see in the article is the struggle with a non-issue: whether or not native land management alters the ecosystem. When you see humans as separate from nature, then you can indeed engage in these discussions of whether or not the landscape is native. When you see the integration of all things living, then it doesn't matter. People are part of the landscape, flowing and evolving together.