Shotone - I agree there were, as ever in such accidents, a plethora of factors contributing to the crash; but, as that excellent article highlights, simply using the controls correctly (they both pressed their takeover buttons in rapid succession increasing the confusion about what control they had over the aircraft) would, at pretty much every stage, have recovered the aircraft to unstalled flight.
It would appear that the problems were correctly diagnosed, both the loss of airspeed info and the subsequent stall - the pilots just did not take the required corrective action.
Stall recovery is about the most basic FW technique taught (I still remember it from Chipmunk and JP 30 plus years ago) so the only explanation of why the pilots in this case didn't perform the recovery is that the level of automation, its complexity and its behaviour in degraded modes overwhelmed them.
Now is that due to poor training, poor quality pilots, CRM breakdown or poor design and display? I don't know.