Language isn’t entirely exclusive to humans. Some animals are linguistic geniuses and can pick up the basics. Kanzi the bonobo did a lot better than Koko and Nim. I don’t think the language acquisition device is a requirement to use language, but it makes it a hell of a lot easier and enables much greater complexity in language.

And of course, language is now an ability humans share with large language models, which do even better than Kanzi at using language.