Do you remember where you played it?
It sounds/looks a little like some of the stuff from bontegames.
That means no need to cool the hydrogen down, making it non-flammable and giving it a higher density than an ion-lithium battery.
Hot hydrogen burns just as well as cold hydrogen. Better, in fact.
How do you spot a greenwash vaporware startup? They promise the earth, use non-existent tech that, if it existed, would be better used in a dozen different places, and target it at residential customers with a subscription model, where the pricing is set before even the specifications.
Sounds like they need to move to either ZIF connectors or 48V power; this kind of power over high pin counts isn’t really practical.
There’s a reason electrical codes don’t usually let you use parallel conductors below about 4AWG/60A per conductor.