FirstStep: thank you for the detailed explanation.
Regardless of whether they were using NADP1 or NADP2, it appears from that brief video clip that things were going wrong before they had reached 800' ... caveat: since what is available on that video clip does not include the take off roll, rotation, etc, the observers in the tower may have seen something during rotation and takeoff that will change the course of this discussion were their observations available.
hectopascal:
The B744 will give a TO config warning if the stab trim is set wrongly once setting TO pwr fyi.
Thank you, sir.
Thought: with reliance more and more on automation and software (my line of thinking at this point refers to the pre flight and mission planning phases) I'll guess that the NTSB team will look into possible GIGO issues before it ever got rolling.