That's what I thought, but it turns out, it doesn't actually matter. The whole point of a representative democracy is that public opinion sways the way the politician votes. Thus Majoritarian Pluralism, albeit not a perfect system, is still supposed to dictate public policy. That's how you define a democracy, even cynically it's tyranny by the majority.

If you were right, that it's due to propaganda, then that would mean that the propaganda machine would work to influence public opinion in a way that supports the will of the Oligarchy. But politicians don't give a flying fuck about public opinion, it no longer influences the way they vote.