What's the historical context here?
It's the first link in the apology page (which in turn is linked to from the tweet).
BTW, Nathaniel J Smith, author of the blog post I've linked to here, is the creator of Trio and all-round awesome open source guy. His other blog posts are well worth reading.
This isn’t limited to python, of course, but (for instance) rust has this reputation as a language but I’ve rarely seen it with popular package maintainers.