Maybe to a degree but this isn’t just somebody using Seeddance to generate a first-frame-and-last-frame video loop and calling it a day.

There's definitely some manual curation. They even have assets that are clearly being placed into the scene, like the boats moving in the water.

You could theoretically generate all possible animated sprites (birds, people, vehicles, etc.) for use in any given cityscape, but automatically segmenting/detecting the different valid "paths/waypoints" where those assets should be placed would probably end up looking pretty janky.