So part of the CVR was not included in the report?
Yes.
the bit where the Captain grumbles he only had one hour of sleep the night before, in Rio, and the two co-pilots had been enjoying the evening as well... that is shocking, looks like a coverup if they don't release the entire CVR ...
That seems to be speculation around a number of unknowns. "Looks like" may or may not match "what actually happened/occurred" and thus IMO BEA can't go much further than they did in estimating the impact of fatigue. Not enough information to go on. If an investigation were to find people who were with the crew the night before, and be able to establish there being somewhere other than in the bed at a certain time before launch, you might have something there. As this evidence is not in the report, I find it a bit harsh to presume the crew were out and about the night before.
And how can CRM ensure that your colleagues are not short of sleep?
There's the question of the week.
My answer: it can't.
Company rules and the professional habits (or lack thereof) among the crew are how you make sure you get your rest before a flight.