In fact, stall warnings seems to have sounded correctly at this point (see above) while the PF was trimming his THS near its max by applying sustained NU orders! Hence, this THS was fully trimmed during the stall sequence, not before it!
Yes it did, but look at it from the standpoint of the PF. He got a stall warning and applied what to him seemed like an approach to stall recovery, and the stall warning eventually extinguished (because he was deeply stalled). The aircraft attitude changed very little. Why should he think he was stalled. He just didn't have airspeed indications, and now the aircraft is acting really strange, dropping wings and things like that, and the altimeter is doing the digital equivalent of unwinding.
