Thats because it IS a PS4 game. Yes, HFW's PS5 version ups the foliage density and makes some upgrades to her character model, but its the same lighting engine, same streaming engine, same everything.
And yes, i captured them on a PS5 back when I was first playing the game and couldnt believe how the game went from looking jaw dropping in the first area to this. The desert area just happens to be ugly as sin. other areas look remarkable.
Like these ones below, but sadly they rely on the fog here as well. I think its because they were still limited by the PS4 5GB vram budget and made sure everything in front of you looked amazing but as the vistas opened up, it kind of exposed the game's shortcomings.