well the two aren’t necessarily exclusive. A speech pattern that obfuscates has many uses. But I think you’re conflating doublespeech and doublethink a bit.
(Fun fact: the term Doublespeak / speech is never actually used in 1984. Like, at all. It gets thrown in because of the doublethink concept, and the fact that everyone weaselwords, but it’s not actually used in the book.)