Power factor is the only thing that makes any kind of sense to me. Utilities don't typically bill you for bad power factor unless you're an industrial power consumer.

I don't know offhand what the power factor of a microwave looks like, but I bet it's not great. I can see an inverter style having better power factor.

Yeah, I have no idea. The article was published in late 2024, maybe they used a late 2024 LLM to help write it? Seems like the sort of confident-but-obviously-wrong mistake that was common back then.