If you're as confused as I am, don't worry. He actually did pitch a complete game shutout of the Salt Lake Bees.
It's been an awful year for Shelby Miller and the Arizona Diamondbacks, with so many bad memories already this year. However the one silver lining to this is that the talent is still there. It's just a matter of him figuring out how to use it then apply it at the major league level in September. In the first game of a doubleheader, Miller was able to throw a 7-inning complete game shutout of the Bees.