Ah, well spotted. Since it's in american it didn't even register with me what size can was called for so I assumed it wanted one of the standard 400g gram cans. I used two of those bad boys and indeed 2 x 400g = 28 ounces. But still don't drain them.
I made this one.
http://www.kingarthurflour.com/recipes/deep-dish-chicago-style-pizza-recipe
You need more water in the dough than they say and are wrong on the tomatoes. Don't drain them and use two cans.