The high prestige jobs the LLMs associated with SAE mostly require higher education, usually post-graduate. Perhaps the model is only accurately learning that

The high prestige jobs the LLMs associated with SAE mostly require higher education, usually post-graduate. Perhaps the model is only accurately learning that more educated people use a particular dialect of English taught by universities. There's really no way to tell, because the researchers didn't include other dialects of English that aren't favored by universities, like southern, or Yorkshire.