Given "in the goo" scan and possibly disoriented pilots, the plane is in the process of a major pull up (nose at or above horizon) when it restalls yet again, accelerated, and falls ... this time, with no altitude left. (Hence not quite hitting in the nose low attitude you suggest ... )
There's another possibility and probably the only one that fits with all the BEA text about vertical acceleration and an attitude comparable to a level flight :
At low altitudes, they recovered all the instruments, checked the descent and were starting to pull out of the descent (dive ? )... they hit the sea surface at the bottom of that recovery curve.
Then you have it all ; centrifugal G forces plus still a downward vertical acceleration, interrupted by the collision with the water, with a lesser longitudinal deceleration which still left important traces.
All the scenarios that involve a stall fail short of the observed attitude published by the BEA.
What I don't know is what law they were in hence whether they could have had a dynamic stall or they just ran out of skyspace.