Yes it is, if ASL is the only language used. However, there are no ASL monolingual programs of which I am aware. The programs incorporating ASL also incorporate English, thus making them bilingual. Bilingual programs do not limit themselves to one language. I would also challenge you to show me a single person who chooses ASL as their primary means of communication that is not bilingual to some degree. All must have interaction with the hearing community, and therefore, all must use English to some degree, whether it is in spoken form, or written form. Can the same be said of the monolingual oralist?