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Gallium does over $500 per kilogram. It is quite an expensive way to produce hydrogen.
After the reaction you have hydrogen gas and a slush with Al/Ga(OH)³ nanoparticles. And then what? How to reform that hydrolyzed Aluminum/Gallium back to pure?
I'm afraid that would take just as much energy as straight electrolysis, there is no free lunch when chemical bonds need to be broken up.
Yet this procedure may circumvent certain problems that do occur with electrolysis, so it may be useful after all. But cheap hydrogen, no. That needs a structural oversupply of renewable energy, and we are not anywhere near that (yet).
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