Regarding the attitude - one would hope at least one of the pilots ignored his senses and trusted the instruments. It seems from the report that (from the lack of reference otherwise) all three ADIs (both PFDs and ISIS) were reading very similar values, so regarding reference to level flight, they shouldn't have had a problem.
Knowing the aircraft to be reasonably upright, but with a screaming altimeter, knowing you are over the ocean with nothing to hit, a pitch-over would seem a far better alternative to not trying stall recovery at all?
As was written above: maybe there was some conflict in data resulting in the pitch-up action?
We need the complete FDR data - too many questions, so few answers.
ECAM Actions.