The author is Raymond Chen, a developer on the Windows team who has been writing well-researched articles about backward compatibility in Windows and MS-DOS for

The author is Raymond Chen, a developer on the Windows team who has been writing well-researched articles about backward compatibility in Windows and MS-DOS for the better part of two decades, so I think it's safe to say he's very well informed on the subject. But I don't think he's "rewriting history" at all, intentionally or otherwise: QDOS/MS-DOS was originally designed to provide a largely CP/M-compatible runtime environment to ease porting, hence "backward compatibility" — "backward", not because MS-DOS was a "successor" or because CP/M was obsolete, but for the simple reason that this compatibility was both one-way and limited to features found in pre-existing versions of CP/M.