Hyperveloce:
The situation as described in the real world would have brought at the least an ADR Disagree and would require cross checking your AOA and A/S data. Meanwhile, the prudent gents would have their eyes on the indicated altitude & VS during all of this and adjust the pitch and power appropriately.
The story credited to "pilotaydin" lays out an uncertifiable behavior for any aircraft. I say the sim was unrealistically programmed, likely on how pitot/air data failure modes were setup.
To go back to AF447, an ADR disagree/unreliable airspeed at that altitude, in moderate to severe turbulence and possible vertical air currents, could be a tough nut to crack on any aircraft, flight envelope protections properly working/fitted/designed or not.