It seems that the southermost buildings will be indeed much closer to the water than what's shown in the 1st link.

See picture 4 in the 2nd link.

http://www.com-saint-martin.fr/PressReleases/Documents%20PDF/2015-06-19-Carbets%20BO-Assemblage.pdf

http://www.stmartinweek.com/rubriques/economie/bye-bye-petites-plages-welcome-les-carbets.html