I think you misread it. One error makes a book NOT inerrant.
I was going the same place you are going with it: Just because a book has some errors in it, doesn't mean it should be condemned. Only God is error free. The men He commands to do things, such as record events, should not be expected to be as infallible as God Himself is.That is the argument of the Bible, BoM, D&C and Pearl of Great Price. Moroni admits errors and say "if they be any condemn, not the word (or things) of God". So where are you going with this?