I'm not qualified, but "The technology could serve as a renewable fuel source in high altitude and polar environments" from the first paragraph of the article suggests to me that the potential is pretty limited.
I wonder about the storage though. One would need to produce during summer/polar day for use in winter/polar night - is it feasible to store large quantities of hydrogen for 6 months?
My understanding is that hydrogen likes to leak because its atoms are smaller than the atoms of anything we’d contain it with. Though there are chemical ways to store it and I’m not familiar with those.