One of the people responsible is working on a detailed write-up: https://starfrost.net/blog/001-mdos4-part-1/

former government employee, CS major, ski lift operator, and summer camp counselor. currently shooting for EMT certification

One of the people responsible is working on a detailed write-up: https://starfrost.net/blog/001-mdos4-part-1/
This is multitasking DOS 4. That's much weirder (and not related) to normal DOS 4. The name is incredibly confusing
Oh I know that. But the official release post called it MS-DOS 4, so...