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systemd doesn't stop the service when the device is removed suggests adding a remove rule to udev which simply runs systemd --no-block stop SOMETHING.service
But what if the unit in question is a user unit, started with ENV{SYSTEMD_USER_WANTS}? systemd --user --no-block stop SOMETHING.service will fail, I assume because udev runs it as not the user for which the unit should be stopped.
One solution is to not try running systemd commands from udev, but instead use StopWhenUnneeded=true. This does however require fixing an underlying issue with the device unit which I've detailed in another answer.
