They don’t address this directly, but is probably what they’re going for given the low deployment cost, no maintence, size, and comparison against other energy sources.
Their proposed device would be really good for distribution if it is cheap and simple. Scale up to port, scale down to truck stop.
Ie: can we make the fastest possible switch to just utilising the atmospheric carbon to power our civilisation, which at least means we aren't going to be burning dead dinosaurs anymore?
The Hydrogen gas is the byproduct of electrolysis/feedstock for the generation of carbon neutral methane (or push up the carbon atoms a bit, if you like).
Conceivably, at a later date, if H2 really does become a viable fuel source/the infrastructure exists, you can then cease compiling to Methane and use the Hydrogen directly.
[0] https://terraformindustries.wordpress.com/2023/06/26/the-ter...
Their problem is that solar power isn't cheap yet. The other big problem is that electrical transmission lines are way more efficient than hydrogen, which 30% efficient on whole cycle. It makes no sense to use hydrogen as energy transport. Cheap hydrogen production at every use point, airport, factory, port, would make sense.