not saying its a problem, just pointing out that its a club, for blacks only, that other races would not be able to join. these are facts
here's their website:
http://www.cosmogolfclub.com
looking at the photo gallery, i've see pictures of some people who aren't black, so yeah i guess a white guy could just go and sign up if he wanted to
maybe you should email them if you're that curious
edit: actually, just read the club manifesto and it clearly states "Recognizing, the need of a local body to conduct and govern tournament play, the Cosmopolitan Golf Club was launched in 1944 as a state chartered nonprofit club with membership open to
all amateur golfers."