Sadly, when it's all said and done, I think we might discover that the THS was at or close to the full NU position and in the "Use Manual Trim Only" mode at impact. This THS flight control degraded mode freezes the THS (trim wheel control only) and thus overpowers the pitching moment of the elevator control power via the sidestick for pitch changes.
I would suggest that at CG positions of say 34-38% which are typical of this type in cruise, that if the THS attained a position of full NU (or close to full NU), that it would cause the a/c to stall and furthermore not allow any chance of stall recovery...unless manual use of the pitch trim is used to reposition the THS in the ND sense.
Just speculation and my humble opinion of course...