I actually thought the same thing when I saw the text on the shield. For some reason it just didn't click right away that it might be for DigiSpark
shields and not for the board itself. I wasn't sure what I'd use it for with the board itself, but I'm sure I'd think of something.
Actually, you probably could connect them together that way, just by setting those 6 pins on the DigiX to be inputs instead of outputs. Power, ground, etc would stay the same, I think. Don't trust me on that, as I don't have the devices in front of me at the moment.
