According to Airbus reply actually Sharket aircraft with double FAC failure remains in normal law. As stated by Airbus:-
The reason behind comes from handling qualities: the Normal Law is more adequate in terms of manoeuvrability and controllability of the A320/A321 Sharklet aircraft when flying with Yaw Damper failure. Nevertheless, we did not want the flight crew to consider that there was no impact of the loss of the Yaw Damper (principally on the protections), and therefore decided the PFD to display Alternate Law.
Please note that this behaviour is true only for A32/A321 Sharklet aircraft, and for the following failures:
1. FAC1 + FAC2
2. FAC1 + Y hydraulic
3. FAC2 + G hydraulic
4. Detected loss of yaw damper