That was a werid flex on admo's part because Biden and his campaign almost immediately realized he had stepped in it, it was stupid
and apologized for his comments.
One of the underrated things about Biden is he realizes when he screwed up and owns up to it. Even if it's just out of self-interested politics, it's the right thing to do.
Trump generally doesn't apologize or feel remorse for anything and if he does, he has to be dragged kicking and screaming to do so. For instance, as ZRod showed, if you asked him, he'd probably still say they're guilty and he was right.
You've got to be very politically motivated to actually believe Biden is racist and Trump isn't.