You're reading way too far into this. It's not even 100% you're fault though. Society is just like this these days. It's honestly ridiculous that we can't just take a game for a game. So it takes place in S. Africa, there's lots of black people over there. The last 4 games you've been shooting fucked up white zombies, so I really think the scale is still tipped in the "I've shot enough whiteys to not be racist" direction.
Seriously though this is just another ridiculous piece to the whole "political correctness" bull shit the world is feeding us. Sesame Street is rated MA becuase Big Bird had an imaginary friends and Bert and Ernie were "gay" (not that little kids even know what the fuck that shit is...). Then we've got people who don't want to be called black, but want to be African American which is retarded. I'm black, brown if I wanna nitpick, but I'm not from Africa, I've never been to Africa, shit past a few TV shows I've never even seen Africa. I'm 100% American. Born and raised here.
It's a video game, there are monumentally more important things you could be worried about than shooting a couple lion chasing zombies. Like cancer or crack. Solve cancer or crack with this energy and let the game be a game. If it was actually viewed as racist by more than stressed out criminology students, extremists, and retards then it wouldn't have been released.