This looks to be the case https://decrypt.co/381296/terrifying-precedent-dutch-hand-us...

The servers were seized under a mutual legal enforcement agreement and it remains to be seen if it underwent a separate Dutch legal review. Quite of a bit of legal footwork gets skipped when the “terrorism” charge is invoked. But it looks like the servers are not being physically turned over, the disks are being imaged and that is what is being transferred.