This is because, not satisfied with supranational integration, which weakens the Member States by ridding them of their sovereignty from the top, or with infranational regionalisation, which works from the bottom up, it is language, one of the essential components of national unity of some Member States, that is being attacked.
Car, non contents d’affaiblir les États en les vidant, par le haut (intégration supranationale) et par le bas (régionalisation infranationale) de leur souveraineté, "on" s’attaque ici à l’une des composantes essentielles de l’unité nationale de certains États membres: la langue.