Let's get this out of the way because I know it's the first thing that popped into your mind: no, this isn't as cool as double-handed Ikaruga or countless bullet hell videos made possible only through years of dedicated training. It just isn't -- plain and simple.
You have to look at this video of some nameless hero kicking ass in Sin and Punishment: Star Successor another way, I think. For an officially sanctioned piece of marketing, it kinda rocks. If memory serves me, the last company to pull a stunt like this was, oddly enough, also Nintendo.