I would think that if Contendah is a COC then his church would have its roots in the Restoration Movement. Thomas and Andrew Campbell are often cited as the leaders of this movement. Hence the term Campbellites. Which is a term often used to describe COC's. From what I understand COC base their beliefs solely and firmly on the books of the New Testament. They are strict adherents of not adding to or taking away from those books. So the Book of Mormon would be something they would most definitely shun.
I could be wrong, but that has been my understanding.