Hi Takata,
If, after a while, a recovery was attempted, the issue faced by the PF could be that he could lack the necessary pitch down authority in order to regain some lift.
I suspect that Airbus have already done some wind tunnel tests to prove what would happen, and the answer most likely was that sufficient THS and elevator authority was available with 29% CG.
The abnormal airflow and drag conditions during this high and increasing angle of attack appears to have had a stabilizing affect. ND on the elevator would have increased the surface area facing the airflow and provided the initial lever to pitch the nose down. Provided the THS followed along, the area and angle to the airflow would have been maintained and eventually all the airfoils would have slipped into an unstalled regime.
There is some evidence that this was tried and unfortunately stopped.