Really, how likely is it that an airline pilot, faced with a stall warning/stick shaker in a situation like this would first think "tailplane stall" rather than the more likely reaction?
Likeliness of something happening is best dismissed and an open mind kept when investigating accidents.
With the evidence at hand it seems it is likely that the stick was pulled back quite quickly and quite hard after the stick shaker...
So you should be asking... ' Why would that happen?'
GPWS ?
Fear of diving into the ground ??
or a more sensible reason? Such as a pre-occupation with an iced-plane and a powerful point making tail-stall instructional video hammering away in the back of the pilot's mind?
A little knowledge is a dangerous thing... especially in technical matters.
It seems lately with 3 or 4 accidents/incidents, that strong, clear and precise, TYPE-SPECIFIC operational information & training is lacking, and generic experience alone, not enough.
Much more cross-pollination & dissemination of vital operational information is needed, in maintenance as well as in the cockpit - IMHO