From the linked page:
Tile control: In Windows 8, it’s much too easy to mess up the Start screen. For example, you can accidentally move a tile by tapping it the wrong way. Or you can bring up the tile-delete screen by simply wiping downward. In Win8.1, you have to go into a special Customize mode (see Figure 1) before you're allowed to move or delete tiles — which is good.
^ wasn't the case for me?