Well if the conversations were largely unintelligible, then I can see why the would leave them out of the CVR transcript. This is different from "censorship".
Otherwise they'd have a CVR transcript filled with items such as "xxx said something similar to yyy" and "cockpit sound heard similar to zzz", which by nature becomes subjective. The transcript is supposed to be an objective record.
Then we'd be here criticizing them for not just "sticking with the facts".