Sorry but that has to be a mistake; especially with the thing about the PC version as there is little to no difference between ultra and 2013 PS4 non pro.
If he really thinks that game is top 5 PS4 then he has not played God of War, the last of us 2, Spider-Man, horizon, The Order, RDR2, Death Stranding, Ghost of Tsushima, Final Fantasy, just to name a few.
As those games would make Witcher 3 a top 10 game, at best.
I am not trying to diss Witcher 3, just stating technical facts.
The Witcher 3 has weird character proportions, movement, as well as animations. The colors especially look very cartoony. It’s like comparing Forza Horizon 4 versus Forza 7, with Witcher 3 being Forza 7. Nobody is going to claim Forza 7 has better lighting or graphics.