Truth in a story does not matter in specific stories. In a story that is declared as a fictious story the truth does not matter because it is used for only entertainment. But when a story is declared as a true story but is actually fictional. It is not right especially if it has actual deep meaning for a specific person.
You can't really tell if a story that claims to be true actually is. The author can say that the book is based on actual facts on real people but you can never truley tell if it is a lie or not. The only way to truley tell if a story is false is if the author publishes it as fiction or if the events of the story extend out of the relm of reality.