Even if you did all the right things, when is the latest you can act?
How would that differ if the trim was neutral?
If the THS would be in neutral position my gues is that they stood a chance even at 7500 feet MSL. The total velocity unfortunately mostly downward was enough to fly and create lift, if they only where able to get the nose down in the flight pass direction. Sort of in the downward part of a loop. Would not even be a real high G maneuver. They where only in a stall not in a spin.
Unfortunately the THS was still in a 13 degree upward position and if it takes a minute for the THS to get to neutral then they had no chance at all even at 15000 feet.
My 2 cents