Several people have noted the 61° AoA of the mainplane and the 45° angle of decent, and agreed that the mainplane was therefore fully stalled.
With a nose-up up-trim of 13° the HS had an AoA of about 48° and was therefore also fully stalled, also with an angle of decent of 45°.
Although the mainplane and HS both had airfoil geometries, they seem to me to have been acting more like two drag-parachutes lowering the aircraft towards the sea.
In fact this arrangement was the answer to the problem that Burt Rutan had to solve it getting his Spaceship 1 safely back from supersonic speeds in space to low sub-sonic speeds in the lower atmosphere.
Spaceship 1 was a variable geometry air/spacecraft in which the tail could be trimmed to a nose-up of about 45°, which was enough to guarantee that both the mainplane and the tail would be fully stalled and act as drag-parachutes, bringing the aircraft back to a low altitude at a safe speed, without any other pilot action.
Once at a safe altitude Spaceship 1 could be trimmed back to normal, and safely transitioned into a glide back to the ground.
Gums Post #771 5th May 2011, 23:45 contains a description of a deep stall in an F-16:
.... with no buffet, vibration, or noise. ……”
That sounds to me as quiet as a parachute drop.
I wonder if that is what it seemed like on AF447?
Maybe a Spaceship 1 pilot (or passenger) could tell us on this thread what a Spaceship 1 re-entry feels like?