Note how the reporter refers to this as "the principal's mistake." He might be able to get away with that if the principal didn't double down on his segregationist practices in the voice mail.
Of course, I could do the "turn this around and make it for whites only" spin on it, but you already know that. I could also point out that if it was "whites only" this would be lead story on all the TV networks. But you know that too. So here is a new observation; black racists are getting bolder. Yes, the school district has realized they have to do damage control, but the principal seems defiant. That's why labeling this "a mistake" is a joke. He knew exactly what he was doing.