But isn't the whole "Russian disinformation" thing in turn a way of discrediting information? Orwell was writing about this 80 years ago, it's never seemed more relevant.
That depends on how you define "whole." There must be examples of people either unknowingly and wrongly invoking "Russian disinformation" or intentionally invoking it for whatever purposes but there is definitely actual "Russian disinformation" occurring. Disinformation from all sorts of sources. It's imperative to be discerning now, and to be discerning about how to be discerning.