Seems to me like the totalitarian regimes see themselves as realist. They just refuse to update when their "reality" does not match the territory. Killing the people who point out the difference is easier. Sometimes they change opinions, but then the new opinion becomes the "reality".

So I would say that totalitarian regimes profess realism. They just refuse the idea of updating, because they believe their map already matches the territory perfectly. And they also refuse the outside view, because they believe to be incomparable to others.

EDIT: Seems like I was probably wrong. I am not sure.