It's based on the console version because that one was done with a later version of Cryengine which DID support multi-core, as does the new Remastered version BUT !!! that doesn't mean it's gonna saturate your 16 core CPU, it just means it's not longer capped to a SINGLE core/thread. So don't expect perfect scaling, which even modern titles don't do anyway. This is still a DX11 game so 4c/8t is basically the best you can hope for.
Furthermore, if you crank up settings to the max WITHOUT UNDERSTANDING WHAT THEY DO, don't complain when your system struggles as it has to deal with LOD0 everywhere! The demands a setting puts on a system is
not equivalent to how it looks to your eyes, so don't expect those 2 to match up. I posted optimised settings on the other page, if you want better than that then you'll have to wait for new hardware. The CIRC settings are
supposed to be punishing for current hardware, they're brute force settings - if you want bang for buck then time to accept lower settings. And yes, if you're using Ryzen, that means lower performance - sorry to tell you but it's not as fast as Intel for gaming.