Very good engine, and obviously the speed with which Kojima's team turned around Death Stranding makes a very strong case for it being efficient and robust as well as powerful.
Bear in mind that its 2 and half years since Horizon was released and no doubt they've been working on improvements for their own specific needs as well as servicing Kojipro's needs. So Horizon 2 no doubt is going to be visually really impressive especially as it'll be targeting PS5.