I've flown both the 767-200 and -300 and both allow for a flaps 1 takeoff. With flaps 1 the slats are deployed and the trailing edge flaps extend out but don't droop down much at all. I'd have to check the aircraft manual to see the weights allowed with flaps 1 but it's also a function of the length of runway available for takeoff. Schipol has some pretty long runways, my guess is it was allowed and they did it by the book...a previous post says it all "You're still here to report the story".