t54: "In the info released so far there is no mention of what the PF did after that stall warning caused by his nose down inputs. It's just surmise that he stopped nose down inputs at that point."
You seem to be laboring under a misconception. The nose down simply reduced AoA. The pitot tube subsequently unblocked. That made the airspeed indication valid again and too low for the indicated AoA. That led to the stall warning.
From the end of the 2 h 10 min 05 interval:
The speed displayed on the left side increased sharply to 215 kt (Mach 0.68). The airplane was then at an altitude of about 37,500 ft and the recorded angle of attack was around 4 degrees.
Note the return if a valid (appearing) airspeed.
From the 2 h 10 min 51 interval:
the stall warning was triggered again.