I never did read that there was a DX12 mod so the game is still DX11 but while have an GPU that can run DX12.x or an OS thats supporting DX12.x the game is still in DX11 mode. And yes, you can run AC with the latest GPU and OS like RTX4070super and Win11.
If wanted, AC can also be forced to run DX10.
Reason for asking?