I don't know how they could approve a show when the third episode has someone in blackface at the beginning. Amazing.
Also, SP is more
VSP than alt-right, given its engaging in centrist strawmen (including the backlash against PC culture, which is also a centrist thing, as can be seen with the Atlantic's constant running of articles about it). That said, the show's matriculation during the rise of the internet, and its edgy nature, more-or-less made those who grew up on 4chan's worst parts attracted to it, hence why it can be seen as "alt-right" to some, even if they take the piss out of white nationalists, xenophobes, homophobes, anti-Semites, etc.
And the alt-right can seem like a catch-all because it generally is: it refers to any right-wing movement that is outside the GOP/Tory norm of the present, and are largely affiliated with younger adherents to the right. Neoreactionaries, the Trump campaign, fascists, neo-Nazis, and redpillers are some of the more well-known parts of this widely varying movement. It's considered an term of import because, despite its broad nature, the alt-right is looking increasingly like it may replace conservatism as the main manifestation of right-wingedness in Western states if it continues to grow and gain advocates.