For a purely mechanical change like this, someone could run black against the same revision of Django and verify the changes they see locally match the changes in this PR.
The same version of black, with the same settings, will always produce the same results from the same input code. Definitely re-producible. That question is about how stable the formatting is from version to version. Which is now more stable, and why Django finally made the move.
Update: Found it:
> How stable is Black’s style?
> Starting in 2022, the formatting output will be stable for the releases made in the same year
https://black.readthedocs.io/en/stable/faq.html