That figures includes all losses from the entire power generation chain, it's hard to take seriously. The heat transfer energy efficiency of an induction stove is about 80-90 %, which is much better than for let's say an electric oven or even a gas stove. Also, electricity for induction can be generated from renewable sources, unlike for gas or open fire cooking.
The large majority of people use the grid, so it's very relevant IMO.
But yes, if you somehow have your own source of energy to power a 2kW it's excellent.
