Some of the clique have been fired later and now CPython is basically a hollow shell with some corporate projects still going on.
The Python community is welcoming, many come for the language and stay for the community. It's not, of course, free of politics or drama, but it's very far from what you describe. Local communities are very strong, CPython core community seems to always be trying to improve to me.
Even Tim Peters, who I really hope is part of the documentary, is an enthusiastic participant, both helping with gnarly CPython issues and providing assistance to newbies.
If you look at the Fellows list[0], you can see that many important names aren't active in the community anymore (I don't know the reasons for each one), but many more are either active or in (very) good terms with the community.
The CoC was and is a net positive, the diversity efforts even more so. Last Saturday I was at a local Python conference and the local community has welcome both, to great success and improvement.
By what measures?