Sapgiola:
It notes no further disagreements between the two recorded speeds for the remainder of the flight; rather, it notes that at various points that "all recorded speeds became invalid" (presumably when they fell below 30KT) or became valid (climbing above 30KT), indicating that they remained consistent with each other.
BEA states that the stall warning system AOA sensor is considered invalid below 60KT.
When stall warning sounds there are 2 actions that can cause the warning to stop:
A: Nose down, gain speed apply power
warning stops
B: Nose up, bleed speed to below 60KT
warning stops.
Given what has been written about low altitude (approach to?) stall Airbus training (must loose minumum altitude) ending up with option B is not as strange as it might appear on paper.
Especially so since the indicated speeds had very recently been unreliable the stall warning may have been suspect as well.