Frey usage of "truth"

Hey, what if Frey told the real truth in his book about his life. I don't think anyone would find it too interesting. I also think that the author of a said book is responsible to clarify the truth exaggerated or bended in the book by adding a section at the end or in the begginning that has the real truth of a said matter. I remember reading "The Da Vinci Code" and in the begginning it said that everything in the book is based on facts, so in order to protect the authors reputation I believe that one could include a section such as the latter only stating the opposite. The truth is, truth is whatever is based on facts and is real according to a sane person. There are differences in perspectives only because there are different ways on viewing things based on numereous reasons such as bia, up-brringings, etc. In non-fiction it is very difficult to round corners. I believe it could be done but must only be done if one could "get away" with it. Such as an instance in which not anybody knows about but the author. But to round corners or bend the truth about history which is important such as ones criminal history, achievements, certain peoples names belongings or property is not appropriate because in the latter case, could ruin ones reputation and in the last could upset individuals unless proper permissions were granted to the said author. In non-fiction one could not make up events/people unless able to "get away" with it but this is very hard to do because then one could not call the book non-fiction. It would be instead called fiction because a person or an event of which never actually occurred could not truly real only imaginativly real to the said author.