Even the apology for being vague and somewhat underhanded is somewhat.. underhanded.
Here is the video shown at the press conference shot using a Lumia 920. On the right is a Lumia 920 prototype with OIS. On the left is a smartphone without OIS. The difference is apparent.
Notice they specify 'a smartphone'. The wording shifts the focus from the camera to OIS, and then they must have used a completely different phone for the comparison. Weird.