@knaivete,
electrolysis of water is about 150 years old technology. I think the article's main issue is how to get all the reactors and storage tanks up there. (Id say, do it in pre machined panels that are joined together on Mars, just like the ISS). Machine the parts here and ship em in segments that can grow .Then , after a time, the entire electrolysis "factories" are built on Mars, maybe underground
There are many new technologies for dissociation of water in low gradient energy fields. Its like the old technology for desal , except its at another energy level that is a function of low P/T gradients.