Access from Germany isn't the issue, having a German IP is the issue. They don't go after foreign seeders because that would be too much hassle getting the real data behind the IP (just like German law doesn't apply to them), but they hunt down seeders with German IP's with quite a vengeance.
They only go for German seeders because asking a foreign ISP for the address of someone who used a particular IP address at a particular date and time would probably get them the middle finger as a reply. In the case of PG, they know who is making the copyrighted content available in Germany, because PG has an address on their website.
And a German court said it's within their jurisdiction.
If you run a mirror with your contact information available, presumably they will contact you next.
Oh they are still around?! Someone should shut them down and jail for the mere reason of the enourmous amount of paper they waste on trolling letters.