It is a smokescreen intended to mislead people by making them believe that their Member State retains its powers, while these powers are gradually being whittled away by the undemocratic means of the case-law of the Court of Justice.
Il s'agit d'un trompe-l'oeil destiné à égarer le citoyen en lui faisant croire que son État national garde ses pouvoirs, alors que ceux-ci lui sont progressivement retirés par le biais antidémocratique de la jurisprudence de la Cour de justice.