What is authorial intent? What is John Green's opinion on authorial intent?

Authorial Intent is the idea that maintains that the person who writes a text has a privileged way to understand its meaning and that because of this, any other way in which said text is interpreted and that contradicts this understanding must conform to the author's intentions.

John Green's opinion on authorial intent is that he thinks it is irrelevant and sees the authors as a character more from the book. He supports those who oppose this thinking.