if it had melted, then it should cover, not could cover! I'm sure that there's some tidal time lag, but such a significant rise to flood FL in 2", well, I think the evidence would be kinda obvious
The description is misleading: why pick Florida? Yes, Florida is a state with more concern than most, but they could just as easily have said that it would cover Rhode Island by 108" of water, or France by half an inch.
But then, nobody really has a good feel for units of volume. No matter how you phrase it, it is a lot of water.