Good essay overall--I pretty much agree--but are you sure that's what's going on here?

Another possibility is that they view "liberty" the standard way, and they view their actions as, say, opposing an Orwellian machine designed to crush the spirit of any who dare resist by forcing them to parrot counterfactual statements and become confused about the basics of reality.

If they believed that, the fact that they were in the grips of what is essentially a fanciful delusion wouldn't mean that they interpreted liberty any differently from most people. It's just that because they had a highly skewed perspective, their actions which would be liberty-promoting if they were right, end up being rather the opposite.