Topic on Talk:Atomic Heart
I'm not in-depth knowledgable of Parallels, but if they support the Direct3D 12 API then the game would still use it, albeit as you say at a lower hardware feature level. Ergo, still technically "DirectX 12" (since D3D12 is not a part of DirectX 11).
Our d3d version rows track Direct3D API usage — not DirectX usage. Hardware feature levels like 11_1 is how the newer Direct3D APIs retain backwards compatibility with older hardware.
I assume that's probably what happens here -- the game uses DirectX 12 while having backwards compatibilitity with DirectX 11-level hardware (most DX12 games tend to have this).