i think the PNF knew that the PF gave upstick inputs since - when the publication of the last conversation is true- the PF stated that he pulled back full for a while. and does the ac not have a stick input indication on the pfd?
i personally do not think that the sidestick concept is an answer why it happened, look how many a320/330/340 fly every day and everything works .
it stays a mysteria why he pulled that much , put the aircraft in a stall and none of the three realized it and recovered.