It actually says what it does in the name without using the idea of racism and white supremacy.
The origin of the words blacklist and whitelist doesn't have anything to do with racism. If someone looks around and only sees racism, then who is the racist?
It's about master copy. You have a master copy, and you have the development copies that are a copy of the master which is where you make your changes.
If i had to guess, the problem is that people don't know how to use git and develop in the master