It’s not the generation of hydrogen (e.g., via electrolysis) that is problematic. The real issue is with how to store and transport the element in a cost-effective fashion. Compression and liquefaction, as Ulf Bossel points out, is too energy-intensive.
But it is not necessarily due to fundamental laws of physics, either, as the article claims. It is conceivable that we may discover a material that bonds with hydrogen atoms densely and allows the hydrogen atoms to be released easily when needed. There are no physical laws that says this cannot happen.