Maybe not, but it is certainly used as one. Everything from package managers (yum) to operating system installers (Anaconda) have been written in Python.
Besides that, the grandparent is right: possibly every situation where Python was used as a systems programming language, Haskell could fit in (and more).
I think you're confused to what "systems" programming entails. User-space packaging with a bunch of scripts is not systems programming. OS installers is not systems programming.
To give you an example of what is systems programming, I have helped developed operating systems kernels, virtual machine monitors, and distributed networked systems. All of these things would be considered systems programming.
You should just read http://home.pacbell.net/ouster/scripting.html (his original paper) because all his statements about systems programming languages reinforces my claim that Python is not a systems programming language.
Besides that, the grandparent is right: possibly every situation where Python was used as a systems programming language, Haskell could fit in (and more).