Torque and power and settings are lost when power goes out due to fuel exhaustion. From an altitude that high, in a small plane, it could twist nearly anywhere ...
If they were not at high altitude (deadly altitude) for so long, coming down towards sea level might allow recovery.
But, after hours of flight with no oxygen, no. Not likely.
Ive heard nothing of Jamaica. Last report in Cuba air space but over the ocean and declining, speed slowing.