I would like to see it under a thermal imager.
The temperature distribution will probably be "interesting".
But maybe it works.
If it is actually solid copper, as they claim, the thermal conductivity will result in it being reasonably even. (I've used big desoldering block tips -- copper blocks with individual wells for every leg of an IC or connector -- to desolder 40-pin (2x20) connectors and various DIP ICs. They're also copper and they heat quite evenly.)