They didn't need an AOA display on their PFD to fly the Aircraft.
I'm getting sick of repeating myself but here goes again.
This is not a new event
Let me say it again
This is not a new event
It's happened before and ALL OPERATORS HAVE PUBLISHED PROCEDURES FROM AIRBUS TO COPE WITH THE PROBLEM OF UNRELIABLE AIRSPEED.
These procedures detail what you can expect to hear and see during the event. They detail explicitly what to do.
Most competent Airline Pilots would have read about this problem, been shown the problem in the Simulator and hopefully bothered to have a think about what they would do if faced by the same event. I know I've put a lot of thought into it and so should have the AF crew.
Ok, so now we are clear.