Actually, the last polling from Real Clear stated Trump at 19-21% among African-American voters.
Let's play a game called let's pick the outliers!
YouGov/Economist: 10% approval
NPR/PBS/Marist: 10% approval
Wall Street Journal/NBC News: 11% approval
ABC News/Washington Post: 7%
YouGov/Economist #2: 13% approval
Rasmussen Reports: 40% approval
Fox News "non-white": 29% approval
Keep telling yourself that "the blacks" love Donald.