If the tailplane came loose from the jackscrew, there would be a very short interval before breakup where various flight parameters would depart from norm.
An explosion that severed the data cable(s) to the recorders would result in recorded parameters being normal to end of recording.
I would expect it would take a reasonably intact fuselage for enough leverage for the tailplane to be ripped out, to say nothing of the forces necessary to free the tailplane from the jackscrew
