Actual article quote is below (emphasis mine):

For this research, the team tested how the three LLMs responded to questions from two datasets: TruthfulQA and SciQ. TruthfulQA is designed to measure a model’s truthfulness (by relying on common misconceptions and literal truths about the real world), while SciQ contains science exam questions testing factual accuracy. The researchers prepended short user biographies to each question, varying three traits: education level, English proficiency, and country of origin.

Tangential, but if it is enforced (alchohol has good reason to do so) it should be enforced impartially regardless of how you look, otherwise it’s discrimination. My comment is based on my Asian looking experience.