There is nothing in your link about "pellets". I clearly assumed you were talking about frozen H2 since this is the standard term in the energy industry, see for example fusion research where solid fuel pellets are used.

High absorbency materials have been around for a while, but they failed commercially, they are typically more trouble then the equivalent high pressure COPV tank. Maybe a hype laden Wordpress template website will change it, but I wouldn't hold my breath.