@Mb:
There appears to be no valid vane function reason for invalidating AOA indications at 60 knots.
Maybe, not sure! this lower CAS speed limit is introduced for maintenance. Sometimes we need to jack (WoW) the A/C for a longer period of time and don't like to introduce spurious Stall Warnings because its highest priority (#1) will prevent other aural attention getters to be noticed.
Why would one jack the A/C in a 60 Knots violent storm? We surely don't!!But for certain tests we have to simulate a - as close as possible flight situation- and therefore can select all kinds of WoW situations. (Nose, LH or and RH main gear) in CMC and that's allowed with all kinds of wind speeds.
Pulling CB of FWC's -to silence the STALLSTALL- for maintenance isn't an option because will also prevent other alerts and warnings to be shown.
I think 60 Kts was initial a compromise, as said before they have changed that with the BUSS mod.