I think Takata makes an interesting point and don't think I have seen it mentioned previously. That is that an ice clogged pitot might also be related to the cabin pressure ACARS msg as I assume the pressure differential is between cabin pressure and outside pressure. Previously I think the options discussed were either a climb or dive greater than 1800fps, or possibly some sort of cabin depressurization.
Cabin pressure is related to outside pressure, but this is measured by the static ports, not pitot. Pitot and static lines are typically on the same probe assembly for smaller a/c, but not on A330.
The effect of a blocked pitot has been discussed elsewhere in this thread...
Chris