That site is hilarious! I didn't know "sea level rise" would affect non-tidal freshwater lakes and estuaries too! Doom! Repent, the end is near!
A five-year old with a crayon and a map would make more sense. Sad thing is this .org is probably pulling in the $$$ from fools and gov't grants.
You may not agree with how much rise, but the maps seem to be based solely on elevation data/contour lines.