Do you have any sources that state that DOS is a part of the NT Kernal? I’ve shown you a couple entries that show that DOS is not resident on WinNT forward, and that DOS runs in emulation from NT forward. NT *is* completely new from the ground up. Maybe you want to look into the terms “Protected” (aka Virtual) and “Real” modes.
Where are your sources?
I already gave all the proof anybody needs. You gave nothing. NT is not new from the ground up. The sources are simple reality, the Windows box that’s probably in front of you right now has tons of DOS legacy in it, some of which I already listed.