The crew has rushed and was clearly poorly prepared, but how would you want them to check those 3 AOA values when only 2 are available and so only indirectly through the third MCDU ... ?
But what about you actually link the document you mention ... ?
BEA Report:
Low speed checks
These are to verify, for an in-service aeroplane, the activation, at scheduled and signalled speeds on the PFD speed band, of the angle of attack protections in normal law.
The description of low speed checks in the ISATM is similar that of low speed tests in the PATM. Ground checks, then checks in flight in clean, then landing, configuration performed between FL100 and FL140, are defined. Before starting low speed checks, the crew must reduce and stabilise speed in order to record the three angle of attack values and compare them to the attitude and pitch.