The usual erroneous pomposity of the arch remainer.
From:
https://hum.port.ac.uk/europeanstudieshub/learning/module-3-governance-in-a-multi-level-europe/direct-effect-and-direct-applicability/#:~:text=Direct applicability talks about whether,EU regulations are directly applicable.
EU treaties and EU regulations are directly applicable. They do not need any other acts of parliament in the member state to make them into law. Therefore, once a treaty is signed or a regulation is passed in Brussels by the Council of Ministers, it instantly becomes applicable in all member states.