That's very disingenuous as Armin Ronacher/mitsuhiko has done so much for Python.
More generally though you're being unfair by not even seriously considering the option that there could be a legitimate reason. Also you're simply being an insulting with your common sense comment.
You are being disingenuous, for pretending this is about truth in some way and you're coming across as being an asshole by insulting people.
1) python setup.py install. Read a Cython tutorial.
2) Install the Rust toolchain and learn Rust. Hope that the language hasn't changed drastically in the past month.
Hm...
But I appreciate the "asshole" ad hominem.
Given that there's an entire article about the technical merits (and success) of this approach, and Armin is someone who is known for building excellent, widely used software, well...
/me waits for pcwalton too
Sorry, writing a blog post, while it is Armin Ronacher's forte (yes, I use the full name as we are not on first-name basis like other HN cool kids are), does not disprove that this is the riskier choice and was made because the author likes Rust.