The upstream issue used this project as a reproducer, and one of the maintainers traced it back to importing pip in the setup.py. This comment may be especially helpful here: https://github.com/pypa/setuptools/issues/2355#issuecomment-685159580
I was able to install correctly on amd64 (because it has a wheel) but failed on arm64 ppc64le * s390x
Looks like there is already an upstream issue. https://github.com/pypa/setuptools/issues/2355