That test didn't seem very scientific. I don't think sitting beside a solid is anything like breathing a gas. If they'd had that can on top of a heat source so that visible fumes were being released I would be impressed. As it is, the video proves nothing other than Zyklon-B was safe to sit beside in powder form.
I think they need to do it again. But this time a camera inside the chamber and an ambulance on hand (or a coroner) would be a good idea.