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The most charitable interpretation is that “generator” just refers to something that keeps your house powered when the grid goes down. It serves exactly the same purpose to the end user as a real generator so it doesn’t really matter what happens behind the scenes.

And that it’s carbon free because in theory it could be charged by purely renewables, especially likely if you have personal solar, vs a real generator which is only burning fuel.

It’s just a clever use of the term for editorial value. I think it works at communicating the use case in the article. No need to ver analyse it.

Fuel cells are batteries that you pour fuel into.