> He provided evidence that cops are more likely to be white supremacists

This is the crux of the matter. I don't agree with that statement. I believe the provided evidence does not support that claim in any meaningful sense.

I would at least agree that it suggests to seriously entertain the possibility though.

I'm not sure what to make of your true/false response. Suppose I claim that apples have a higher chance of poisoning you than oranges. Evidence that someone at some point made an effort to put poison into the apple supply does not directly support that claim. However if credible it is certainly cause to entertain the possibility.

More generally a claim about a possibility (discreet) can be supported by an event but a claim about averages (statistical) requires population data. Further, a claim that X is more likely than Y is a claim involving multiple populations.