This is the key error message. Once this happened, they were doomed because the flight-control system is then not operational, and the pilot has no mechanical backup and no way to control the A/C. The flight control surfaces go nuts.......
Who knows what occurred here, but I think a stall is unlikely. If the computer 'sees' low speed from the dead pitot heads, it would probably lower the nose and a dive would occur, without a stall. After passing Vne, it would break up.
Something odd, generators shut down which usually indicates an engine failure, but no fault codes for the same. And the rudder full travel fault... If an engine failed due to hail and a severe yaw occurred, with a corrsponding over-travel of the rudder. That scenario could have done them in also. Thoughts?