That quote from the Advocate General - there are pillocks like that in every government in every country. Real politics is about organising to get rid of them, and it has to be done repeatedly, like flies in the kitchen. I can't see how any law trying to ban people from criticising the European Union could stand up in court any more in Europe than it would, in America.
Unless of course the court was packed with bent and subservient judges, as can happen. But that kind of thing is probably easier to achieve in a nation state anyway. (An Advocate General is a lawyer, not a judge. Lawyers are there to try to twist the law to suit their clients, and that includes government lawyers.)