'WoW' is involved in the FWC stall warning logic but here it is called flight phase [IN FLIGHT = flight phases 5,6 & 7).
!But that is not the issue!
All 3 ADIRUs did send an AoA SSM NCD (No Computed Data) signal, for the FWC this means there was no valid AoA to compare against a threshold which depends on Mach, S/F and SB config.
(Max AoA threshold 16.3º in S/F Config FULL (ALTERNATE & DIRECT ) and a fixed 23º in NORMAL)
Actually this philosophy is identical to Boeing T7 only the values are different.
Now if you want the system to be changed the solution has to be found in the ADIRUs NCD state within ARINC specification.
(in AF447 the measured air speed was sometimes 0kt - and even negative q -, just setting a lower value or 0kt would not have solved the issue here.)
For accuracy of the vane:
The AoA vane accuracy is shopchecked in a laminar air flow windtunnel at 100kt.
At an offset of 3º(+/- 0.2º) from original value the vane should return to original position within 0.25º with a max. overshoot of 0.5º to pass this accuracy check.