Took me a minute to find the video, so here is a link.
I think it is a short lived gimmick item. Problem with smoke is it will follow the heat, which is naturally drafting up to the path of least resistance. I would be surprised if there was any significant smoke flow down into those stacked pans and especially under the meat. Initially it sounds good, but I think the physics are more against it actually working. Now if there were solid pans at the bottom and the ones that stack above (or is it "staxx" above) had slotted bottoms, they there may be some additional flow, but again, the smoke follows the heat up and out. Not sideways and not downward into a pan through a small slot on the side when there is an open path available.
I could be wrong though, but that is my take on the design.
One could pretty much accomplish the same thing (and this works as I've done it), by taking pizza screens and stacking them with meat and using wooden blocks as spacers to gain extra grates. Depending on size, a dozen screens is about $15 to $25. Like this (cold smoke of goldfish crackers with spices). For meat, a little more separation between the items on the screens would work. The wood blocks came from a plain old white wood 2x4 and unless you are smoking at 400* or more (which ain't smoking in the first place), the wood should be fine.