They’ve got a quite unusual stove that’s got a large battery in it so that it can operate when the power is off, and doesn’t need the installation of a 240v power connection. This avoids the cost of an electrical retrofit of old apartment buildings, which otherwise costs far more.
If you’ve already got your home wired for 240v, you can get an induction stove for far less.
These battery-equipped stoves are expensive right now because they’re being made in quite small numbers. The parts needed are coming down in price quite rapidly, so I expect to see them sold in the $2000/unit price range within a few years.
Did you read the article? Or even the two paragraphs long summary of the article OP posted?
I did read the summary, but aren’t the standard voltage of a power outlet 230~V? Maybe I’m too tired and missing something.
EDIT: I forgot that the US uses a different standard, my bad.