At https://github.com/microsoft/MS-DOS/blob/main/v4.0/src/DOS/S... it used to have Tim Patterson's full name whereas after the force push they abbreviated it to his initials "TP".

I had the repo cloned before the force push and when I went to pull it, this file was the only one that contained a conflict.

Looks like the handiwork of Mark Zbikowski, whose initials adorn every EXE file. https://en.wikipedia.org/wiki/Mark_Zbikowski

Mark is the one that committed today's source release, going off of the "MZ is back" commit message from GitHub user "mzbik".