That's absolutely genius! I want one now.. lol. A smokehouse has been on my list for a while, but that looks like it would be relatively simple. Super smart to have it set up so you can just use oven racks and slide them right in.
Just me and my kids, off griddin' it - follow along our shenanigans at our YouTube Uncle Dutch Farms.
To me, the defining characteristic of a rocket stove is the insulated heat riser which contains a "domesticated chimney fire," where it gets so hot that the smoke and wood gases burn up. So, that's definitely not happening here, the goal is slow and low combustion.
The shape is reminiscent of a rocket stove, so I can see how you could call it a smothered rocket stove. You wouldn't want to build an actual rocket stove from concrete blocks, because they couldn't take the heat. For this application it's just fine.