deeply stalled
As posted way back, at least one jet I flew had a true "deep stall" in which recovery using conventional control movements was not possible. I even posted the graph of pitch moments. The good news was unconventional control applications could "rock" the jet outta the deep stall.
I can not say if the AF447 jet was in a true "deep stall" without seeing the pitch moment charts for its c.g. and AoA. I would say the thing was "deeply" stalled and held there due to pilot inputs and the trimmed stabilizer that reduced nose down authority.
As another contributor posted here a day ago, a similar condition in the sim was overcome and he flew the plane out of the stall.