Somewhat reluctant to get involved with the discussion as I fing the report about RYR and subsequent KLM to be sleazy journalism, but have to correct one thing about what has been written in regards to KLM fuel policy.
EU OPS specify as contingency fuel, either 5%, 3% with an ERA, or a statistical value to be approved by the authority. None to be less than 5 minutes.
KLM uses the statistical method. However the data being used is NOT from the last month as stated before but from the last 2 years!! Specifically, flight number, time and season etc, etc! They than define that into a 90 or 99 percent coverage. The decision to take either the 90 or 99 is dependant on whether the destination has more than 2 runways and forecasted visibility above 3000 mtrs.
This is the minimum fuel as calculated by dispatch!! The pilots then check the flightplan, wx, notams, etc, etc. and then decide whether they are happy or not which that number. If they are not they input a different fuel number in the flightplan computer!! No dispatch involved, nobody to tell you can't!! As a courtesy, usually the dispatcher is called and informed as for the reason but he doesn't argue!!
For RYR, I have no idea but neither had the Dutch reporter!