English is not my native language, but why is it "is" and not "are"? Isn't "the Netherlands" plural?
In english it is The Netherlands, but in dutch it is Nederland, unless you are referring to the various provinces, to which the plural applies. The reason likely rests there.
A nice explanation here on the difference between (The Kingdom of) the Netherlands and Holland. Perhaps they are referring to Aruba or Curacao in the sentence not Amsterdam or the Hague.