No he didn't, but unless you are claiming that the entire Word, including the Word incarnate, can be completely contained within a book, or that John is claiming that his own writings contain all of the Word the passage clearly doesn't mean what you are implying.
You know what I am claiming and that claim is a rebuttal to your statement that
Were all that is necessary containable in a Book God would have repeated the Mosaic process and sent the Gospel on Stone Tablets. Instead He sent His Son to establish a Church.
And yes again, all that was necessary is contained within a book, the Bible...