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.
Have you considered emailing/PMing the developer? Especially with a donation?
Running APKs from random people is not the best policy.