The platform/publisher paradigm is a false dichotomy because of section 230, as your article points out. The idea that section 230 hinges on some notion of political neutrality is an editorialized opinion by the author, not a statement based on the law. In reality, efforts to legislate political neutrality are not only impossible to enforce, but they would likely be challenged on a 1st amendment basis (i.e. forcing a private entity to broadcast political messages they disagree with on their own dime).