Like Kalen said, Jack's statement may give us an indication of how much input he had on those early courses he helped design. I'm thinking of Harbour Towne and Muirfield Village. He shares design credit. But by his own word, he knew nothing then. And none of the courses he designed under his own name have come close to matching them.
Jack has made many real good courses on his own. But no truly great ones. In golf itself, he is one of the immortals. In golf architecture, he is a solid touring pro, but he's no Jack Nicklaus.