It's all in here already if you took the time to read.
The OK sign is not used by white racists or White Power people. It's a hoax that was created... read your own link...
I did read it. It's a meme that turned into a hoax that turned into a real thing when it started being used by alt-right figures like Cernovich and Milo.
It goes like this:
/Right-wing person A flashes the OK hand symbol on TV
/Left-wing person B says Hey that's a racist symbol, these days
/Right-wing person A says how dare you good sir I am outraged that you would defame my good name and take a perfectly harmless gesture and twist it don't you realize I'm 1/20th Cherokee etc etc
/Media outrage ensues
/Right-wing trolls react to media outrage by talking about how oppressive and hysterical the left-wing have become that they can even take something as innocent as an OK gesture and turn it into racism, they just see racism everywhere, see the left are the REAL oppressors of free speech.
/Right-wing person A is very happy.