reflex
JJFFC
Ok I understand an incorrect reflex action by 80%.
However this incident went way beyond reflex with 4 minutes of stick back, with PF saying he has been sticking back is not a reflex. It is some evidence of a conscious action i.e. observe, analyse, take action and communicate. Also 2 others in the cockpit also agree with the nose up attitude and resort to focussing on keeping the wings level.
Under your hypthesis we say they correctly identified stall, did a bad reflex for 4 minutes. All 3 failed to communicate stall. In fact they all appear to say they have no idea what is happening.
IMHO the facts as they stand do not back this hypothesis up.