Agree with DozyWannabe,
Most displays would show the correct indication IF actually only the ASIs were affected. May I add, and raise a question at the same time (maybe already noted somewhere before), what about the VSI readings in front of each pilot? According the A320 manuals (my current aircraft), it is given by both the static ports AND the IRUs, I would imagine the A330 to be wired with the same logic, so even in case of FULL loss or ADR DATA or ADR voted out by the system, the VSI should (was?) still be showing from the IRUs inputs.
Despite the apparent confusion, night IMC, probable turbulence at some point, the VSI would have been a good confirmation that the aircraft was going downhill?
Of course this is just one aspect and does not pretend to invalidate any findings, I am just curious I have not seen it here.
Flex