This is because you don't need to. Especially for this particular script.

If you're using the natively included python, pyobjc comes free.

As soon as I saw that mentioned in the documentation, I knew this project was going to have issues.

I'm familiar with python bridges at all - how would someone transition something with pyobjc as a dependency to the native alternative you mention?

You misunderstand.

OS X has shipped with python for quite some time.

In addition, OS X python started including a build of pyobjc since OS X 10.5

You literally can fire up python from the terminal on OS X 10.5 and later and type: import Foundation and it will "just work".

No additional installs required.