I'm always skeptical about these type of stories when there's a larger agenda at play. This could be bait for a "muh white superman-acy" angle to get more people riled up at whites.
The audio was cut and spliced so he could have been talking about something else entirely.
Now, I'm not entirely cynical, so it's probably legit and if so then the guy sounds like scuм but I always question any news, even from the so called "good guys" because often times you can detect an agenda or some "nose" behind the scenes.