South Park never goes fully in on a celebrity unless they've really done something to deserve it, George is just a fantasy author guy who got popular really fast because of a very succesful, popular adaption. They went the perfect route by turning him into a goofy, Weiner-obsessed "just wait and see" guy, like either he is closeted gay and can laugh at harmless jabs or he is straight and can realize "yeah maybe I do a few more graphic-detailing's of the phallic nature than other fantasy authors" which is something I'm sure he's already thought about and made peace with.