For some closure:
The policy was updated (in #1036). The new version is now live on devguide.
Per the PR text:
Petr’s text from the discuss thread is used, omitting any mention of the PSF Contributor Agreement (CLA) as discussion revealed that it may not make sense for all repos (see thread).
It also adopts a suggestion from Joannah to have people discuss additions in our Committers forum before bringing an addition to the Python Steering Council.