These type of pranks/mix-ups/whatever happen more often than one might think. Even if it had happened, CNN had nothing to do with it; it's the cable headend.
Of course, CNN is one of the alt-right's biggest targets, so that means the fake rumors are going to start coming against them, just as they did throughout the general, just as they did against Ted Cruz, etc., etc...
"To find out who rules over you, simply find out who you are not allowed to criticize." —An all-too-true quote from a sleazy person