Since the a/c was almost immediately in "test pilot territory", what role could immediate Autotrim NU have played in a potential recovery? The THS, as takata has said, does not trim UP when g thresholds are exceeded. At the least, it would have provided a more immediate climb, and not required the PF to continue his ever increasing NU demands. Can't think of everything, I guess. That "Zoom" thing. We know that 330 can recover from STALL, it is patent.
Seems if this THS had not held back, the a/c would have STALLED with a great deal more energy in its airframe, perhaps emphatically dropping her nose, etc. The tail drag did them in.
then again, the safety record is exemplary.
It is assuredly coincidence, but when the THS was needed for climb, it was not available. Later, when it was not needed, it came back, and ruined the trajectory. Still later, it prevented a recovery by limiting elevator authority all the way down.
The way I see it