otherwise he would have lowered the nose at least on the horizon and let it be there for a while.
The nose was down 10° at least twice, so well
below the horizon, but with a flight path angle below -25° (obviously the limit of the FDR) that still gives an AoA beyond stall. Unfortunately many pilots do not understand, that AoA and Pitch can differ more than 30° in a stall situation...