Hi DozzyWannabe & IanW,
I agree with both your posts and believe it points to another couple of holes in the cheese lining up.
The auditory overload of ALT Alert, ECAM Dings, "Read ECAM" etc. possibly led to the mental exclusion of "Stall Stall". They simply didn't hear it. In a previous post (512), I mentioned another crew who didn't hear "Dual Input" for over 90 seconds.
Both pilots are provided with the FD/AP modes on their PFDs so they can monitor what the AP/FD is attempting to do - yet when manual flying without the FD, PNF has absolutely no idea what input PF is making (due Side Stick design) or what he is aiming for. PNF probably did not realise how much over controlling input was being made by PF.