The full quote is:

"Employee demographics are “diverse,” sort of—I would guess, based on a visual survey of the cafeteria at lunchtime, that about a third of the staff is South Asian, a third is East Asian, and a third is white. The workers are overwhelmingly male."

That second sentence that the original poster here dropped gives you explicit clarification vs solely trying to infer what the quotation marks are doing.

As well as the overwhelming majority-male workforce, which is mentioned right below this in the article.