There are multiple histories of various musical systems which are encompassed by music theory.
If you want to exclude every non-western musical system from “the history of musical theory” and define “music theory” as exclusively pertaining to western-style notation, then that’s a really shitty and eurocentric outlook, and that’s on you.
Music theory has a history, and you seem to be completely ignorant of it.
There are multiple histories of various musical systems which are encompassed by music theory.
If you want to exclude every non-western musical system from “the history of musical theory” and define “music theory” as exclusively pertaining to western-style notation, then that’s a really shitty and eurocentric outlook, and that’s on you.