I would have upmodded you but I already replied elsewhere. I didn't know it was a kort geding, as indeed there it's very important to show up. TPB should really get a better lawyer. OTOH, they might get sued in a lot of countries, so it's for them undoable to visit each and every one of them to go to a court hearing, I think.
I don't believe Brein has a good case against ISPs as they're not involved in the lawsuit: if Brein orders them to block a certain site, they can simply say they (ISPs) aren't ordered to do so because the site has to block the NL visitors, not an ISP, it would otherwise come down to censorship for the entire population ordered by civil court, which can never happen, as Brein is a civil organisation.
But with dutch judges, one never knows...