No, the water is not where it was 50 years ago..did you know that half of a1a ended up underwater a long time ago due to rising sea lvl..of course it happened gradually...

If you would like to take a step back way further, you would know that before the Ice age ( when there were no polar ice caps ) that Florida was a swamp! Almost all underwater! Then, came the ice age that took some of the water away ( it froze )...

I can see where they are coming from..due to the rise , and change in climate / temprature, these ice caps are melting..and when it lets the water back into the major bodies the sea lvl will rise...

You have to look at the painted picture of the future, and learn your past / history correctly.