Turbulators have been around for a while in one shape or another. Some old Dovres used them and so did some Consolidated Dutchwest stoves. I seem to recall one being used in a very old stove (one of the Oaks?) too.
The Jotul looks pretty simple, which is good. The blanket arched over the turbulator is a bit odd. It may aid flow over the turbulator but it looks like it will reduce heat from the stovetop too.