It really highlights how terribly trained the pilots involved are - temporary inconsistency in measured speeds (there are still plenty of reasonable speed sources) in almost all other planes does not result in the plane crashing. Heck, my GPS can do groundspeed easily enough and you have basic pitch and power settings.
How did they not notice their altitude was climbing as they pulled the plane up - they got into a CLIMB rate of 7,000 feet per minute - that's STUPID! WHY climb like that? This has nothing to do with airspeed.
The stall alarm goes off 75 times!
They reduce power to idle for a bit??
It's total nonsense, anyone who has flown a single engine cessna for 200 hours or more would have been able to get out of this easily just based on stall buffet and stall alarms.