User blog comment:Lolzernator/Is this a real mission?/@comment-399926-20100827205218/@comment-399926-20100827211058

It's unlikely that they would make a mission with such an obvious name and allow it to be spoiled so easily. Not to mention, the mission name "Demo" and the lack of proper capitalization as with the other mission titles.

Also, in the same video, Chuck exhibits some abnormal properties - for instance, not taking damage or flinching when attacked. Not at all surprising if it's a demo to test or showcase weapons.