This sounds like BS. Years ago I calculated the cost of electricity is 1/5 of gas. Unless electricity jacked up (gas has stayed roughly the same) this doesn't make sense.
Depends on your housing situation I assume. Mile for mile in a similarly specced car (V6 honda accord vs Model 3 Long Range) my electricity costs are about 1/4 what I paid in gas. But that's because I can charge at home. If I had to exclusively supercharge, they'd be about the same.
Thankfully I don't have to, so I get to wake up every morning to a full car