Hmm... interesting hypothesis, I guess I never associated flash freezing with world wide flooding, but massive storms can certainly be driven by massive temperature differences, so I guess it’s something to think about.
Very warm super moist high water vapor, high pressure atmosphere,....rapid sudden cooling....immediate massive condensation as heat is forcibly released from the vapor due to rapid cooling...a 40 day massive rain all over the Earth....deep Earth quakes too as water is released from the depths of the Earth. Rapid continental shifts occurred as well.