The master terminology in Git is very likely historically tied to the master/slave metaphor, originally from bitkeeper.
https://mail.gnome.org/archives/desktop-devel-list/2019-May/...
https://mail.gnome.org/archives/desktop-devel-list/2019-May/...
Here is the bitkeeper documentation[1] saying "we are then going to modify the file on both the master and slave repository and then merge the work."
Safe to say that's in the context of source control? If you meant to say "based on how git works..." then sure, that's a more accurate claim.
https://github.com/bitkeeper-scm/bitkeeper/blob/master/doc/H...