Sorry I was trying to convey that. But language is often messy. I completely agree with you. I thought my parenthetical mention of Github clarified this but I guess I wasn't clear. I'm not sure how to edit to resolve. Any suggestions?

You're wrong - etymology is via bitkeeper which has slave repositories and master repos.

https://mail.gnome.org/archives/desktop-devel-list/2020-June... for a description of what happened; tldr it isn't.

That link doesn't say anything contrary to what I said, and indeed includes a link to a twitter thread saying that Bitkeeper may very well be the origin of the 'master' terminology in git.