Netherlands is protected by dams. The solid geology of the area has allowed for durable dams to be constructed over centuries.
Places like Florida are going to be severely hit by rising sea levels because so much of the land is porous. You can't build a dam to stop the sea if it seeps in from underground.
Well, given that it predicts half of the Netherlands will be flooded with just a 1m rise in sea level, which happens about twice a day, I'm a bit sceptical.