It’s not just that it’s a “world with mechanical animals”, it’s the entire design aesthetic is completely lifted from Horizon. It’s obviously a different kind of game, but the character and animal designs look straight out of the Horizon games.
I could see a system where you very loosely define a handful of keyframes, give it some kind of description for what your looking for, and then the model fills in the rest for you. It almost certainly would still require some tweaking on the artists part, but I think a huge benefit is that AI can be non-deterministic. If you don’t like what you got you can just run it again without changing inputs. Maybe save multiple runs and manually combine all the best elements. Lots of opportunity.
Most digital animation done by hand isn’t done in the stop motion/frame-by-frame way, It’s done with key frames that are interpolated between. That’s not to say it isn’t still super time consuming (especially when done well).
It’s not just that it’s a “world with mechanical animals”, it’s the entire design aesthetic is completely lifted from Horizon. It’s obviously a different kind of game, but the character and animal designs look straight out of the Horizon games.