They really missed the critical point, which is a comparison of the cycle life of fuel cells versus lithium batteries.
They mentioned an estimated 30 year life for this system versus 15 years for a lithium-ion battery. I would estimate more like 10 years for lithium-ion. If they use a high-end catalyst for the oxygen electrodes in the fuel cell and electrolyzer, 30 years is reasonable for a hydrogen fuel cell system. A 3x lifetime is a good advantage.