Titan, whose orbital period is 382 hours, is tidally locked, like all round moons in the Solar System. But Jonathan I. Lunine said of Titan:
One thing that Titan could not have done during its history is to have a liquid layer that then froze over, because during the freezing process, Titan’s rotation rate would have gone way, way up.
This hypothetical escape from tidal locking implies thermal energy lost from a liquid layer would be converted into rotational kinetic energy, and not just for the liquid in the form of currents (in analogy with e.g. the super-rotation of Venus's atmosphere), but of the solid majority of Titan's mass. What mechanism is Lunine alluding to?