You seem hung up on a secondary effect, when there was a serious primary problem with the all-important FBW flight controller. If the input to the FCS is garbage due to A/S sensor failure, then the output moving the flight surfaces will be garbage. The FBW alt. law message indicates that either most of the sensors were screwed up or the computers were. The later Flight envelope message strongly suggests that the output was indeed garbage.
What are the possible (given the scenario) causes for the FBW Flight Controller problem?