The author makes the mistake of ambiguity. Colloquially, "a better x than most" implicitly means "a better x than most x", which Scott Adams is probably not for

The author makes the mistake of ambiguity. Colloquially, "a better x than most" implicitly means "a better x than most x", which Scott Adams is probably not for x = illustrator, but the author means "a better illustrator than most people" (I think), which Scott Adams certainly is.