I like that his Scouse still shows through.
But tbf, what he did was sort of the correct thing to do. He was being interviewed by French journalists. He can't speak French. If he spoke in his normal Scouse accent nobody would be able to understand him. Therefore why not speak in the sort of English they'd hear if they themselves were speaking English?
Alth admittedly his usage of the Gallic Shrug was a little unnecessary.