First off, that is a ridiculous statement. What makes a person native is the way they live with and relate to their natural environment. Secondly, these are Amazonian natives and probably don't have much European blood. They haven't been subjected to the horrors of the reservation. They are just killed outright by governments and corporations.
I had a feeling the people of no substance would show up.
Blood and genetics matter. So does culture. The fact is that the pretend Amazonians have too much white blood and too much white culture to be the real thing. Do you know the difference between a pure blood Arabian horse and a mule? Same thing applies here. The folks in the photo are neither fish nor fowl. They're something else...something sui generis.