I'm most interested in the the rust->iron electrolysis process - neither the article nor the video describes how that's done, except to mention that the process

I'm most interested in the the rust->iron electrolysis process - neither the article nor the video describes how that's done, except to mention that the process used clean electricity. Certainly it's possible, but I don't think there's much electrolytically produced iron today. I wonder if they're using a process that requires the oxide to be melted (very simple but needs really high temps) or a lower-temp, more chemically involved process. If they have a good-enough way to produce elemental iron, it seems like replacing an existing coal/gas fired iron smelter with a renewable electrolytic one would be a cool experiment too.