He's playing to the white nationalist once again.
I don't think that is the reasoning. Trump's team has told him that his biggest problem is with college white women, especially those who think he is racially insensitive. But I don't see how talking like this helps, even though I am guessing in his mind this is the way to solve his suburban mom problem. This is his way of saying "see look, I care about black people"
Yep, he is trying to get the vote of people who, mistakenly, do not consider themselves racist.