To capture this epic gameplay video, the YouTuber used an AMD Ryzen 9 7950X along with 32GB of DDR5 RAM and an NVIDIA GeForce RTX 4090. Unfortunately, no Performance Overlay is included, so we can only guess what framerates the RTX 4090 manages to achieve at this dizzying resolution.
Although he claims to have shared his counter list, it is hard to find an updated version on his site. So either he's running with an older list, or he hasn't published the latest one yet.
However, the good news is that you can use a number of mods to achieve a similar visual expression as in the video. And frankly, I don't see any reason to use Reshade Ray Tracing. The Witcher 3 Next-Gen offers native RT effects, which I would definitely recommend for the ultimate image quality. Save yourself the trouble with Reshade RT mods for this specific title.