DJ77:
Obviously, confusers cannot just cancel stall warnings on the basis that Mach number is unreliable.
Well the stall warning -is- cancelled if the sensed speed goes below 60Kts and then comes back when > 60Kts so maybe not so obvious to the designers that cancelling an in progress stall warning is suboptimal.
This snip from the report, well into the descent with the plane undeniably stalled, is the second instance the stall warning coming and going with invaled speeds could have further confused the pilots:
Around fifteen seconds later, the PF made pitch-down inputs. Inthe following moments, the angle of attack decreased, the speeds became valid again and the stall warning sounded again.
The report then mentions dual sidestick inputs at that point but frustratingly does not specify if they match or in what direction.