It's so obvious that it doesn't really bear analysis.
I mean, even in canon Eric Cartman is often used to just recite shitty (usually) right-wing arguments - so, since the show is still running, a lot of his beliefs have direct crossover with the alt. right.
But also, a lot of kids are "Eric Cartman." Like I was once a fat kid who hated everything and adopted certain stances just to hurt people, too.