Are not the instrument cluster in the top right Backup analog instruments ????
Yes they are.
However they use the pitot-static input and since that was iced over they read wrong.
To all you other naysayers
THIS IS NOT A DESIGN FLAW. It is Physics. It has nothing to do with the fly-by-wire. The pitot static system works the same way they always have. If the pilot was too poorly trained to know how they back systems worked under adverse conditions they are to blame (or their trainers are).
This is like someone crashing a car because they were so use to anti-lock brakes they did not know how to stop a car on ice that did not have anti-lock. You can’t blame the brakes. You blame the person that got behind the power curve in an aircraft they did not know how to fully operate.