DX12 is like Windows 10. Games are coded for Windows 10. Games made for Windows 7 or 8 can still run in Windows 10, but in compatibility mode.
Likewise the games u mention will still run in an DX12 environment with DX12-supported GPUs. But they will be only capable of running DX11. So they will run DX11-mode in the DX12 environment.
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