I feel like you're making three statistical mistakes at once.
- First, we're not discussing the English level of the general Chinese population, but specifically of the group that's also good at programming. That conditional probability is much higher.
- Even if we did speak of the general Chinese population, that is a lot of people so something rare in that group is true for many people still!
- It's not like everyone in the US has great English either. (Though open source maintainers are again probably more likely to.)
- First, we're not discussing the English level of the general Chinese population, but specifically of the group that's also good at programming. That conditional probability is much higher.
- Even if we did speak of the general Chinese population, that is a lot of people so something rare in that group is true for many people still!
- It's not like everyone in the US has great English either. (Though open source maintainers are again probably more likely to.)