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The article doesn’t say if it’s electrolysis. But the efficiency must be better than electrolysis for it to replace electrolysis.
https://www.eurekalert.org/pub_releases/2021-07/uota-mch071921.php
I think it might be more practical to combine a solar array, electrolytic hydrogen generator and other equipment into a single compact unit that is mass produced at the lowest cost as possible. Then it will need to be supplied with water and its output will be green hydrogen under pressure.