Takata
I'm sticking with the impact description provided by the BEA and I can't see why such a description would imply a mandatory "deep stalled" attitude ; the vertical vector may also be due to inertia.
Ok, So they were gliding down with inadequate power to fly?. Is that what you suspect? If so what kind of airspeed would they be indicating? Approximately what flight path angle relative to the surface.? (Or what would you do in the circumstances?)
Probably due to engine core icing I assume. But the engines didn't "phone home"? Wouldn't they be expected to?
And I too accept the BEA impact description-as far as it goes.