With my limited IT background, I would guess that it's not as straight forward as entering your username and password.
Remember this was not a one-off exercise. They will require the same system for future elections. Therefore its integrity must be maintained. You don't want the system studied for future hacking, knowing too well that both Nasa and Jubilee are sending 'IT experts'.
I think the guys in Europe had to create some kind of sandbox on short notice. Concealing the workings of the system and at the same time complying with the court order might be more challenging that non-technical people can comprehend.