I'm not interested in this game (although I'm sure some people will love it, especially my niece) but it shows the same code runs much worse on PS5 and that's very telling. Sony fans were believing PS5 is much easier to develop games, and here we can see how it works in reality


.
Well, that answers all the questions right there.
Use a shitty development API, get shitty results.
This isn't news.
Yesterday he said Orphan can run at 120fps on PS5 but at lower resolution. So even if he will redirect audio resources to the dedicated chip this game will be still GPU limited. That's probably why he is saying 120fps on PS5 is nothing certain, because CPU is not the bottleneck.
Xbox One X can run it this game at 4K 60fps, while PS5 struggle to hit 120fps? I can believe that because I have seen RX580 vs 5700XT comparisons and 10TF RDNA1 wasnt exactly 2x better compared to 6TF GCN Polaris.
There are few examples with 100% scaling, but most of the time it was below 100%. Of course PS5 GPU will be a little bit better than 5700XT thanks to RDNA2, but Xbox One X GPU was also better than standard RX580.
MS has said not every game will show perfect scaling using just architecture gains alone and that's why they wanted to build XSX with exactly 2x more TFLOPS in order to double Xbox One X GPU performance in every game. PS5 GPU is 10TF and that's assuming the best scenario (variable clock), so people should be really no surprised PS5 GPU cant double Xbox One X results so easily.