This article and the one before it are based on a paper in nature that says if the seas rise 10ft-23ft that New Orleans is screwed. Notably it does not predict this, just says that if sea levels rise the city is screwed. Which it is!
But so is lower Manhattan, Miami, 60% of the land in the Netherlands, almost all of Bangladesh, along with numerous other places.
Now 3m-7m is vastly higher than any current predictions, but hey lets scare monger about a single city!