It means that no matter what you write, be it a biography, an autobiography, a detective novel, or a conversation on the street, it all becomes fiction as soon as you write it down. ↗
An autobiography is not about pictures; it's about the stories; it's about honesty and as much truth as you can tell without coming too close to other people's privacy. ↗
After reading Eminem's autobiography, which I did because I'm so interested in him as an artist, I respect him a lot. Even though he seems angry and mad, he's had to fight so many demons in his life. ↗