Liberalism IS the center. That you cannot grasp that, literally explains why you have misinterpreted the show. Right wing american political framing has eroded your ability to tell up from down and left from right. America is a liberal democratic republic. Liberalism is the foundational ideology of western liberal democracies, making Liberalism the center by definition.
It is obvious that the show has an explicitly leftist worldview. It critiques liberalism and conservatism. It explicitly condemns American fascism, capitalism and imperialism. It also explicitly condemns liberal feminism, feminist pinkwashing, and liberal identity politics being used to drive corporate profits. All of those critiques can only be done through a leftist lens.