Wait - so you entire opinion about Deaf cultural being fictional, is based on you reading one book and being late-deafened?
Those of us who have had hearing loss or have been Deaf since birth, who's first language is ASL, who follow cultural and social norms of the Deaf community, who have Deaf families, who have rich communities...our cultural identities do not exist because you read one book? Even in high school courses, in order to pass an essay you must cite at least 3-5 sources.
Have you been to the Deaf culture Center in Toronto? It is in the distillery district. I suggest you check it out. There are hearing people who work there so communication shouldn't be an issue.