This doesn't make sense. Both land sinking and water rising contribute together to 11mm/y ground level going closer to sea level. And the sinking has >2x effect.
Tl;dr they are screwed.
It doesn’t make sense if you think that water incursion has the same solution space as sinking land
It doesn’t make sense if you think New Orleans is the only city with this problem
So of course, it doesn’t make sense, if you’re unaligned from reality.