That's hardly "busted." Even if it were, pointing out one instance does not expose the techniques that these charlatans rely on or the defective modes of thinking that make people credulous of them. These clips do the work much better (starting around 1 minute into the first one):
The Carrot (Season 6, Episode 15) - Video Clips - South Park Studios
The Other Side (Season 6, Episode 15) - Video Clips - South Park Studios
In the second one, Stan gets his own television show in which he tries to expose the fraud in cold reading techniques, but no matter what he does, the audience believes that he is exhibiting actual psychic powers.