There are a lot of kind of questionable/obscure skills in tiers 2-4, but I think that's fine actually. It's not a software development skill assessment; it purports to be only about "python expertise." There are definitely people out there with strong knowledge of every topic in item 3 and I'd definitely be persuadable that such a person is a "Python expert."

I just worry, when I see a list of things tagged "expert" like this, that people will take it as a learning path, which... Could be good, but there are much straighter paths to learning to be effective as a developer.