It is a clbuttic problem. Their politics demands extricating the world "master" from speech because of its supposed connection to slavery. Unfortunately things like "master record vinyl" would lead to "main record vinyl" or "parent record vinyl". This makes it a clbuttic problem. And it isn't that the "pair" must exist. Things that are expressed in the "master record" concept will thus need to be clubuttic'ified.
Why it this? Because it is not motivated by code improvement but by political demands. The clarity of meaning will be lost by these changes for future developers, because of the need to censure the word "master" from speech and writing.
And yes, this sets a precedent that all you need to do find more words on the euphemism treadmill that may be labeled offensive to force their replacement. This will result in further loss of clarity in documentation where clarity can be reduced whenever someone demands that "for diversity reasons" words need to be deleted.