It's getting hard to remember (!)
I think this is a manual edit : The metarelate PR mentioned *should* match these, but I think there were concerns about how quickly that could be done (ha, ha), and how it might merge with other outstanding proposed changes there, so we proposed these changes separately and they have not come "via" metarelate in this case.
We were expecting these changes eventually to be subsumed by a new PR to install the latest metarelate output.

The changes themselves effectively "replace" the buggy rules removed from save_rules.txt (in sensible cases, that is).