I'm not sure if this has been asked or discussed previously, but do the pilots have a GPS or INS based groundspeed readout on their displays? Also i was under the impression that heavy jets are equipped with AoA sensors?
Would not a very low groundspeed and high AoA readout cause the assumption of a stall? especially seeing as these readouts would not be related to the Pitot system if it was faulty.
Sorry if this is unrelated or has been discussed I have not followed this from the beginning and have not flown anything more complex than piston twins.