Westhawk
Core lock being affected by a turbine overheat depends on where in the rotor geomentry the lock is occuring (compressor vs turbine) and what torque conditions are on the rotor at the time of the thermal pinch.
If the pinch point is in the compressor it probably wouldn't be affected by thermal conditions in the turbine. If the pinch point only freezes to a stop when the engine RPM is depressed far below idle speeds then it should be avoidable by keeping the windmill rotor speeds up. Just how much contribution of all this in the referenced accident is as you say still under review.