Hydrogen will be carried in an absorptive material inside a tank. Neither high pressure nor cryogenic tanks will be needed.
I addressed the issue of storage as a gas because the article only spoke of that means of storage.
Nevertheless, there is no weight or volume advantage to storing hydrogen in another material. No matter the material you use, you will either drastically increase weight, volume or (more likely) both.
For example (since you didn't identify any specific material), here is what happens when you use a metal hydride as a storage medium for hydrogen: The metal hydride storage will be 20 times heavier and nearly 3 times the volume than an equal energy-quantity of gasoline.
In the example using a 12 gallon gasoline tank, that means your fuel would now weigh more than 1,500 pounds! You'd be better off sticking with the high pressure tanks (gag)!
--Boot Hill