I think you misunderstood it. This game was made for PS4 and focused on that for a while, they shifted to cross gen and added some enhancements recently but its still a primary PS4 game.https://www.google.com/amp/s/www.gameinformer.com/feature/2020/09/08/20-questions-and-answers-about-kena-bridge-of-spirits%3Famp
It doesn't need to but it would be a huge help. I think it wil be.
What is the advantage of PS5 vs PS4?
We only saw the game running on PlayStation 5, so we can't offer any side-by-side comparisons, but there are differences between the PS4 and PS5 versions. One of the most notable is the number of Rot that you'll see onscreen. On PS5, all of them can be visible simultaneously. On PS4, you'll still be able to collect all 100 of them in the world, but you'll see fewer of them at a time. They won't be any less effective in combat or during puzzle solving, but there won't be as many of them visible at once. Also, the forests and overall foliage is denser on PlayStation 5.