No, you can't bend a note before you strike it. But if you watch the video again you'll see that he hits the notes he's going to bend down near the hinge and swipes toward the key edge from there. It looks and sounds like he slides a semitone down by playing the key a semitone higher than his destination note.

Hey, they're not saying they can do anything with this system. They're just saying they can add a lot of expression to keyboard playing, which I think is undeniable.

Is this a half-baked idea? I don't think so. Is it economically viable? That remains to be seen. It certainly is not viable in its present form. I think it will have to be much cheaper to implement than polyphonic aftertouch ever was (that being the main reason you don't see the latter anymore, not its difficulty of control). And it has to be so unobtrusive that you can't tell it's there if you don't enable it.