Some things need to be made clear;
The ac was at 'approximately' 1000' AMSL and 100 kts GS when the engines stopped.
The biggest red herring that has been latched on to in this whole thread is the Nr Warning.
Remember that the power off Nr range is from 80% to 112% putting the point at which the Low Nr Warning activates (<97%) just above the mid range point.
As can been seen in my picture below the Power off Nr range is the inner green band. The needle is pointing at 97%, the point at which the Low Nr Warnings both aural and visual are activated.
The first low Nr warning did not come on until late in the Warning Unit indicators timeline on page 33.
The warning came on, went off, came on, came on went off and then came on again.
This to me would probably suggest that the Nr was indeed being controlled in the middle of the band and well within the power off limits ... right until the very end.