What we call Orwellian revisionist history is really Stalinist revisionist history.
George Orwell wrote 1984 and Animal Farm about the Western European Stalinists who absolutely refused to recognize the horrible things Stalin had done to his people.
Whether the director is a practicing Marxist is beside the point. He uses the tactics of the Stalinists. Destroy all evidence and admit nothink.
Hiding what one thinks in order to avoid losing one's job seems closer to what the victims of Stalinism went through, albeit they could lose far more than their job.
Unless you have reason to think this guy is a mass murderer, it seems to me pretty absurd to compare him to Stalin. I think it most likely that at worst he is an idiot who thinks Stalin wasn't that bad or some nonsense.