[aDyslecticCrow]

I thought the same thing, but no, the chemical process is different. Iron-air batteries are traditional flowcell batteries (with some extra complications).

This paper uses hydrogen as an intermediary, which has advantages but also adds some questionable margins in efficiency. But I don't know the efficiency of the suggested iron-air batteries either.

This may be nicer if you want hydrogen rather than an electric battery. But if you turn that hydrogen into a fuel cell... the efficiencies of producing and consuming that hydrogen add up.