the crew missed so many cues from the instruments they did have that having an AoA indicator on top of those likely wouldn't have made much difference.
The crew were certainly very confused but I believe the Captain would have recognised that they were stalled if the aircraft had this new FWC installed.
"STALL WARNING enhancement: Stall warning will work when:
Undetected erroneous computation of pitot
Pitot out of the airflow
Pitot obstructed by ice or any foreign material at any speed (function now possible below 60 kts)"
@ DozyWannabe. I seem to remember that you argued the AoA probes would be unreliable if the IAS indicated less than 60 kts despite being airborne.