If the original wording in the Wikipedia page was the way it is now, the "incomplete and false" was attributed as a quote made by the Prime Minster, and it appears that that's what he actually did say - or, rather the more correct translation, "incomplete and incorrect."
The present wording says "Later that year, Prime-Minister Jan Peter Balkenende stated that she had given "incomplete and incorrect information" to Queen Beatrix and to him about the duration and extent of her relationship with drug kingpin Klaas Bruinsma," which shows that "incomplete and incorrect" is a direct quote from the Prime Minister. If they changed that to say "...Prime-Minister Jan Peter Balkenende stated that she had given "incomplete information" to Queen Beatrix and to him...", they're falsifying what he said. This isn't a case of the Wikipedia author claiming that they gave incorrect information, it's a case of the Prime Minister saying it, and being known to have said it, and of them changing what he said. That's seriously unethical.