Who says he actually pulled back on the control column? AE 4184 had control issues that came from ice build up. It may be that the change in pitch associated with flap exentions caused an airflow pattern that forced the controls back. Don't rush to judgement so fast.
FDR tapes show he pulled the yoke back, then relaxed the back pressure....aerodynamic forces would have pitched the elevator to the nose up position and left it there.
It looks to me that, the crew was distracting themselves with conversation during a very critical phase of flight. No one was flying the plane, ot someone would have seen the speed decaying. They should not have even been in the stall to begin with, but when they found themselves there, the Captain's recovery was not correct. Maybe he thought he was in a tail stall, maybe not, but he should have been paying attention to his airplane during the approach.