Just saw
the whole clip. The chick introduces it by saying, "We're always trying to harness new technology and create new ways of playing the game. With that in mind, please let me welcome Saxs Persson, from Microsoft Studios, and we're excited to be able to show a new version of Minecraft built specifically for Microsoft Hololens." So, no real disclaimer there.
Then the dude takes the stage and says, "Thank you, Lydia. To show our demo today, we're using a special camera. This display technique is like putting a Hololens right on the camera itself, allowing the entire audience to see the hologram.
Now, this is a live demo, with real working code. Let's show what it can do." So, not only did he misrepresent what was actually happening, he actually went out of his way to lie about it, claiming it was done live with real code, when it was clearly choreographed, just like the Kinect Star Wars stuff.