The subtitle of this article is "‘Jarring’ study reveals hiring bias at US institutions." Trying to ascertain whether prestige leads to "hiring bias" is asking

The subtitle of this article is "‘Jarring’ study reveals hiring bias at US institutions." Trying to ascertain whether prestige leads to "hiring bias" is asking whether it has an independent effect on hiring. If prestige had zero effect -- if the observed correlation was actually measuring markers of researcher quality with which prestige is likely to be correlated -- then there would be zero bias. The fact that those institutions did many horrible things historically does not provide evidence on that question. That's why I called it a non-sequitur.