Do I have to provide my own wording/content?

Do I have to provide my own wording/content?

Nobody knows you, and your books, better than you do yourself.  While we can guide you in terms of grammar, syntax, and readability, it would be difficult for us to write all your content from scratch without knowing enough about you. It’s therefore best if you write your own and we’ll make whatever changes we feel are necessary, but will run them by you first.