If I'm refactoring, truly refactoring, a 10k line PR where all the renaming happens at once is mandatory or else it won't compile. The only other option would be incremental refactors with an intermediate, parallel state that adds complexity, increases the likelihood of missing something and makes a 30 minute, 1 time PR review become 12x10 minute PR reviews.

Obviously it has to be a pure refactor, entirely isolated from functional changes but there are plenty of similar cases where doing it once is the least effort.