Alas, it doesn’t give the assumptions, nor how many degrees of warming or feet of sea level rise it would take, so I find it more a scare story than a meaningful warning.
Indeed, the fine print reveals that “This experiment is not an exercise in climate prediction. There is no correlation between the consequence chosen and the address entered. Our algorithm applies a systematic transformation regardless of the address.” So, yes, just a scare story. Technologically, the flood equivalent of putting a mask on a person’s photo.
Even so, we still have something real to worry about.