There is some seriously nice camping gear on that site. Thanks for that link.
I've seen similar elsewhere, but not identical to these.
There is one enormous design difference between these camping grills and the tabletop grills this place was selling.
The insulation.
These table tops use compressed diatomaceous earth blocks that is apparently is so good, you can touch the outside after hours of cooking. The byproduct Im gleaning from that is that containment also focuses the heat reflectively increasing performance and focusing IR part of the 1000-1800 degree charcoal .
(after owning a pool with DE filter for 15 years - I had never heard of this use of the material.)
You can see this in the upper stove on the circular stand.