Ah, there is a logical fallacy there. That logical fallacy that is just because they reused the same bitkeeper word that they took it from there AND are using it in the same sense. Ultimately this is a strawman, you are putting Bitkeeper's practice and arguments onto git.

Slave is never used once in git documentation, never has been and never will be: https://git-scm.com/search/results?search=slave

Wrong, it was indeed from "master recording": https://twitter.com/xpasky/status/1272280760280637441

That tweet is from the original creator who made "master" the default branch in git.