Since I cannot respond to the creator of the trophy guide, I'll make an edit for him/her. The Shutout! cannot be earned in the manner described in the guide.
I'm assuming you are going for the Platinum and have at least two motion controllers. The easiest way to do this trophy is to create a two-player, head-to-head match. Make sure to change the settings to an 11 point match before your character select screen. Calibrate the controllers and set the 2nd player's controller down. Sweep the match and your trophy will pop.
Hope this helps those who were misled.