How pyudev is LGPL license but libudev-dev is GPL license?

Question

The systemd source indicating udev is GPL license:

systemd$ vim LICENSES/README.md
The following exceptions apply:

 * some udev sources under src/udev/ are licensed under **GPL-2.0-or-later**, so the
   udev binaries as a whole are also distributed under **GPL-2.0-or-later**.

While the corresponding python package pyudev is LGPL license: https://pypi.org/project/pyudev/

Any idea is more then welcome