The accepted definition of the "deep stall" or "super stall" is that of Davies', which refers solely to the blanked T-tail designs.
A deep stall is any stall that cannot be remedied with elevators.
For what it's worth. I fly Airbus, and it has NEVER been marketed or 'sold' to me as being un-stallable. Look at the damn attitude display and the speed !!!!
When it was identified in the 1960s that rear engined T-tail aircraft could enter a deep stall, stick pushers and shakers were added until it was almost impossible to enter that condition.
We now have a situation where underslung engined aircraft can also enter a deep stall, if the thrust remains at cruise or higher. And this applies to both Airbus and Boeing designs.
In normal law, an Airbus should never enter this state, but in alternate law it certainly can (as can Boeing twins). There is no reason why a stick pusher or a thrust reducer cannot be applied in these cases, where the aircraft is in alternate law. A thrust reduction at the point of stall, will lower the nose quite sharply (if the stick is neutral or forward of neutral) and make the exit of the stall relatively simple.