The wood gas stove uses fuel more efficiently, more thermal energy for the same amount of fuel. This is just a large one. It is more than just a fire pit...

not really, its sized/sold/marketed as a firepit that produces less smoke
less smoke can be achieved with an "upside down" fire and windbreak/skirt (bucket, trash barrel)
in the picture above they're grilling a few steaks , there is some 9kg-20kg of wood loaded into this fire pit ...
sure its based on a woodgas stove and uses some of the principles, but its primarily heating the sky
otoh
pyro-grilling