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That aside does the book seriously rip on South Park? Does he even watch the show? Granted the political edge of the show may not be quite as sharp as the Daily Show/Colbert Report's edge, the show is easily as smart and satirical as those two. Often that satire is pointed elsewhere.
People that still deride South Park as little more than poo-poo and potty humor need to realize the show has moved on.
[This is not to say that Parker and Stone are above feces and semen jokes, they just don't base the show around them anymore, and it's debatable if they ever did in the first place.]