They didn’t admit that Stalin wasn’t a dictator, though. That’s what I’m getting at. The document makes no such claim and is itself just a report by an unevaluated anonymous source rather than an official statement by the organisation as a whole. In plenty of other declassified CIA documents (including official memos), it is argued in great length that Stalin was a dictator

If you want to argue that Stalin wasn’t a dictator, then be my guest, but to claim that the CIA itself acknowledged this is a falsehood