The BEA report tell us that the THS remained at 13% nose up including during the nose down stick input
The Perpignan A320 report says something quite critical - the THS only moves once the elevators are driven beyond neutral.
It's not enough just to push the stick forward, the elevators have to go past the neutral setting.
I don't know if the A330 works the same way. But that would explain why the THS stayed put despite nose-down stick.