Unless I missed something, no one ever addressed the original question, which is how we know the policy was enforced along racially discriminatory lines. This requires knowing the extent of cheating in various racial groups and the extent of enforcement in each group. No evidence of the former has been presented.

Even if most of the people who were disciplined are from URM groups, that doesn't prove racially-biased enforcement.

Weirdly to you, perhaps, I am absolutely confident that there is a high degree of probability about your story (that expulsions for cheating were enforced along racial or gender lines) is accurate. Maybe I’m just overzealously arguing about the verifiability of it.