These long duration iron based "batteries" are often up against creating and storing hydrogen as a competitor rather than lithium or even sodium based batteries

These long duration iron based "batteries" are often up against creating and storing hydrogen as a competitor rather than lithium or even sodium based batteries. This one seems to directly involve Hydrogen production. Cheaper standard batteries will definitely crimp its market, especially anywhere vaguely sunny, but growing markets for green hydrogen are more likely to kill it entirely. Why store Hydrogen in a clunky way when it can be bought and sold directly.