The old instructor support had this line:
"Landing gear has to be extended by gravity (paper c/l) and NWS is systematically lost. In the event of loss of G +B, the speed has to be increased to 200 kt during gravity extension to provide a good pitch control until stabilized".
"The approach after landing gear extension may require (ECAM procedure) a voluntary disconnection of the ATHR (G + B) in order to obtain an easier a/c pitch control during approach and go around."
It appears it had more to do with gear extension than flaps. ATHR off course will complicate matters because of degraded pitch control. What happens if you lower flaps2 with gear up can be checked in the SIM.