Hydrides have *always* been the dark horse in the H2 storage race.
40atm is c 600psi. This is *very* reasonable compared to the 5000psi of normal GH2 tanks and +50c - +350c is also a *lot* easier to handle IRL than the -250c needed for LH2 (unless you are used to fueling launch vehicles).
Let's not forget that the cooling or compressing can use 3x the amount of energy needed to *make* the H2 in the first place.
Bringing the storage temp and pressure more into a range most people are comfortable would make Hydrogen more acceptable but probably cheaper.
Thumbs up for them pursuing a smart rather than simple solution to a very difficult problem.