mm43
It can be deduced that the elevator response is related to pilot input and modified as function of Pitch Rate / Flight Path rate or G at High Speed.
As KCAS was low at the time you have been discussing, the elevator was acting more in accordance with pilot input, rather than G.
Think it through again.
The general misinterpretation of DW and some others,
--if stick released or neutral , then the nose would drop---
is not changed by your excellent reference. from your source:
HENCE, STICK FREE, the AC maintains its flightpath even in case of speed changes............
Stick neutral equals no command to change pitch rate and no demand to change load factor, therefore the FCPC´s use the elevators to maintain the flightpath. That is achievable in the non stalled environment, but not in a stalled condition. There i would substitute ( but that is my own interpretation) the word FLIGHT PATH (which was 45° down) with something like ordered flightpath (defined by nose position in relation to pitch and speed).
In the fully stalled condition the FCPC´s on the order of the SS tried to achieve a flightpath, the AC was not capable to give, therefore elevators and THS full NU. At release of the SS to neutral, the FCPC´s would try to hold the last achieved by maintaining 1g or by keeping zero pitch change. Both would lead to the fact, that no change on the elevators would schow despite the stick movement.
Only a prominent and prolonged SS down would move the elevators out of the full ND position and hopefully lead to the lowering of the pitch.
But anywhere in the phase of the pitch reduction, when commanded flightpath had not yet reached the actual flightpath (45°down) and stick would be brought back to neutral, the FCPC´s would order again a NU elevator to maintain this flightpath disregarding the fact, that it was not yet achievable.
No fun at all.