I imagine that by “pre-rendered footage” they mean it’s an in-game trailer but with bespoke animations and scripting. Which is probably the best you can expect at this sort of time before release; it at least shows you how animals will look and how closely zoo design might conform to park creation in Jurassic World and Planet Coaster.
There is more info out there, but it’s naturally made solely of marketing at the moment. https://planetzoogame.com