Maybe they have. Maybe they have a workaround. l have no idea. I do know, however, that getting a signal out of a Faraday cage is a problem.Given that metal domed grills own most of the total industry marketshare (Weber alone is 54% I was told), it seems quite odd to consider the possibility that no one would have ever tested the transmission from a kettle...
These cookers are imperfect cages, however, so maybe that is enough. Or maybe they thought that would be enough and are now finding out differently: " ... also testing and fine tuning the wireless range capability ..." That sort of thing is normally done during prototyping. Leaving it to the pilot production stage risks building a batch of products that don't work and can't be fixed.