The technology has to follow the legal requirements, not the other way around.
Given the possibility that this is a general problem of AI that simply cannot be corrected, the law could end up meaning that LLMs are outright forbidden in the EU. If that's true then the legal requirements will have to be changed, there's no way the EU would actually ban them. It'd be like opting out of the internal combustion engine due to some detail of an old law that they happened to violate.