They know they’re lying, but for liberals, truth is whatever serves The Party and if you say something often enough it becomes true. So they’re just posting a truth higher than the facts.
“You are a slow learner, Winston."
"How can I help it? How can I help but see what is in front of my eyes? Two and two are four."
"Sometimes, Winston. Sometimes they are five. Sometimes they are three. Sometimes they are all of them at once. You must try harder. It is not easy to become sane.”
― George Orwell, 1984