There is of course some truth to that, but in this case I think it's a bit unfair to conservatives. The words "freedom" and "liberty" do have reasonably consistent and coherent conservative meanings. They're just different than what libertarians, classical liberals, etc. mean when they use those words (negative liberty) and what liberals, social democrats, etc mean (positive liberty).

But I do agree that Politics and the English Language should be read by everyone, so I'm always glad to see it linked to.