That's right.
The simple Maze design has no additional surface area over the core, which is bad, and only allows it to work well with a thick bp.
In this design, and similarly Cathar's WW, the fins/dimples give us the additional surface area that we need, and with the jets, the turbulence (both for WW and this design) required to improve cooling, most efficiently.
Remember, WW's bp is less than 1 mm! I don't know what you are using, but this design is the cheapest, closest, easiest thing to WW that just about anyone can build. I would *roughly* predict that 1.5 mm should perform nicely.
Some more info
here .