My point, which I guess I didn't state as explicitly as I needed to, is that the entire linguistic premise of newspeak in 1984 is essentially nonsense. Language simply doesn't work that way, and people's understanding of words does not generally derive from dictionaries.
To pose a simple question to you, of all the words you know, how many of them did you learn by consulting a dictionary? Or perhaps even more simply, how many times have you looked at a dictionary in the past year?
For the vast majority of people, the answers are "a tiny fraction" and "single digits".