Such a snarky response, but I can't deny it. I see a JS package that hasn't been updated in a year and I expect that it won't even build with my environment because webpack evolution. I see a python package that hasn't been updated in a year and it doesn't faze me. Not a whole lot that can break in terms of building and integration with my python project.
Perspective is everything. Now and again I use C libraries that haven't been updated in 15 years. Why? There isn't a need. Everything builds perfectly, and some of those libraries are still the go-to solutions in my field.
Its front page describes it as an experiment, and it has 98 open bugs. Both PyPy and Python have released new versions since the last update of this project, so it's at least missing important updates.