Having watched one all the way through and the second partway, all the motion shots beyond the "horse" on the display stand slowly rocking fore-and-aft (plugged into the mains even?) are CG.

A careful listen beyond the superlatives and puffing tell us they aren't remotely close. I was so hoping there had been a breakthrough in practical hydrogen power to be announced, but a careful listen gleans the admission there is not yet a viable power-plant. Same with any motion other than (possibly) at current robot speeds, so more like riding an ox rather than a horse.

Oddly, most (somewhat carelessly on the part of the animators) shots show the mockup hinged like a human on all fours rather than a horse, hardly taking a lesson from mountain goats as the "brochure" claims. That is all we have here, an initial concept presented in CG video brochures intended as lures for investors, rather than any sort of announcement of even a prototype.

I feel the whole engine discussion is a red herring for some reason, as a piston engine cannot produce the work in a form that would drive the legs. Certainly, hydrogen generated electricity would be driving servo-motors rather than requiring an engine of sorts.

All in all, the stuff of science-fiction at the moment, the two vids being completely GC (and mediocre CG work at that) with an AI narrator. Nothing to see here, and nothing closer to reality than those cool levitating speeder-bikes the Imperial Stormtroopers were riding in the forest with the Ewoks in the Star Wars films.

That said, "I want one"? Sure! Would I want one of those Star Wars things more? O hell yes!