@WhyByFlyer
I am in no way saying that the Bus can't be stalled. Laws of physics apply equally to all aircraft.
However, regarding your scenario:
The AoA protection (as the name implies) is based on angle of attack, not on airspeed (regardless of whatever the FAC calculates and presents on PFD) and it should be able to ovrride the high speed protection. What happened to you in the sim is (hopefully!) just a simulator glitch. If the real a/c behaves the same way, then we have a serious problem...
I do agree however, that switching off 2 ADR's is the quickest way to get into ALTN Law, anytime the FBW system decides to go AWOL...