the sitcom that's shown during must shit tv appears to be the drew carey show which suggests that hbc is a stand in for abc where tdcs aired this is further supported by the idea that the episode is parodying nypd blue which aired on abc though the article currently lacks verification that this was the show they intended to parody however hbc is also used in other episodes of the series such as south park is gay where it's a stand in for bravo or more likely its parent company nbc therefore it seems hbc is just a generic name chosen to represent tv studios and not a jab at a specific one