2013 - 84 = 1929, that’s when he would have to be born.
1929 - 1865 = 64 years old in 1929, to have been born slaves in Mississippi. It’s rather unlikely that his parents would have been born slaves; quite possibly his grandparents could have been. Maybe he was raised by his grandparents?
This person’s math is as good as Rachel Jeantel’s reading skills. And how do we know this isn’t some brainwashed college student making all this garbage up?