Is it possible that the PNF had less visual feedback on what the PF was actually doing due to the little Airbus sidesticks rather than traditional joysticks? Surely for any pilot the sight of the PF hauling desperately back on the stick ad infinitum would have maybe aided in his diagnosis of the problem (not withstanding the immediate resounding of the stall alarm the one time that the PF stopped pulling back)?
From what I've read I don't think that they're wrong to blame the PF as his initial reaction to the cacaphony of alarms was all wrong given the situation. However, AF failed on the implementation of pitot tube technical diversity despite previous warning incidents, adequacy of their pilot training can be put in question, and some the Airbus alarms and systems really didn't help in the correction of the initial error.