I think what he/she means is that the people have no idea what they are talking about! They want to raise a whole city by filling x meters3 with concrete or cement or earth? New Orleans was about 907.0 km², the article suggests more than 20 ft., = ~6 m, coming out to 5,442 km3. Usually when that much Earth is formed, its from a supervolcano, La Garita Caldera, Colorado, United States spewed over 5,000 km³ of lava, decimating any life in its path. The Earth sure is eco-friendly.
The most recent supervolcano to erupt (~4000 yrs. ago), was at Lake Toba, Sumatra, Indonesia (2,800 km³), aka the Toba catastrophe. The eruption at Lake Toba plunged the world into a volcanic winter -- the same thing that would happen from an asteroid impact or if all the nuclear weapons were set off at this instant -- and is thought to be responsible for the incredible bottleneck in the human population (~4000 yrs. ago), a near extinction.
By comparision to all these thousands of cubic kilometers, the Mt. St. Helens eruption of 1980 ejected less than 1 km³
I would laugh at anyone who thinks it will happen, to New Orleans. Sure some people would like it to happen but, we are not at a point in any widespread ideological movement at which something like that would happen.