80% of the study participants represent 12% of the world population, and do not represent the world population. That is pretty compelling evidence for bias in global research. This also validates the course's critique of monolingual ideology. Authors are trying to provide an alternative viewpoint that can counter the systemic prejudices discussed by Baldwin and Alvarez et al, who argue that standards are historically and ideologically constructed.
Framing: Use this quote (citing Henrich et al., the study mentioned by Maia and Gomes) to establish the Authority and Relevance of the source, demonstrating that the foundation of the standardization debate often rests on research that ignores the vast majority of human linguistic reality. Introduce the Karajá article as the necessary data point that corrects this bias by focusing on a non-WEIRD society.