Contacting an immigration agency in Canada, who handle Iranian immigration cases, I got this information:
Then he has lied on his immigration/visa application.
If the divorce invalidates, it means he has been married. Then stating his status as single is a lie with which he cannot get away with. It might not end up in deportation necessarily, but it is not very unlikely either.
Also should thank @Hilmar for his comments on stack exchange.
I add this edit only to help future readers, I hope it will come handy to someone.
There is a center called Justice Access Center which offers legal advises, mediation and some other services. They offer pro bono services. You can reach them here.
There is an organization for Iranian women in Ontario. They also are very helpful and have access to precious resources. You can reach them here.
I hope these can save some women from abuse or threat.