In fact, the PC version has two 4k settings (High and Ultra) but as the review, from which the benchmark is taken, notes;
The only way to get Yakuza Kiwami 2 to run at 60+ FPS here is to run the game with a lower resolution scale, delivering a sub-4K image
A (still) £1100 GPU cannot hit, nevermind lock, 60fps on Dragon Engine at 4k.
Another review actually tried benchmarks at High settings
It's actually not so different from Ultra, despite most of the settings like DOF and shadow quality being lowered. The 2080 TI still manages only 51 average FPS at 4k, which should be further evidence of how badly optimised the engine is. The RX Vega 64 never set the world alight, but it's a 12.6tflops GPU and should not be throttled that hard (sub-30fps average at 4k) on a game like this.
I don't see how anyone can look at these figures and come away believing the PS5 will run this game at 4k/60fps. It will almost certainly have parity with XsX and I don't believe for a second it would have been designed any other way, even if it could do more.
Parity will be the norm this gen in most cases simply because it's less headache.