Anything can be an act of war.

https://en.wikipedia.org/wiki/War_of_Jenkins%27_Ear

https://en.wikipedia.org/wiki/Pig_War_(1859)

https://en.wikipedia.org/wiki/Football_War

Or we just make them up. https://en.wikipedia.org/wiki/Colin_Powell%27s_presentation_...

No, the Netherlands won't consider this to be anything of the sort.