FWIW, N=1: I'm Dutch and don't recall the word "uitwaaien" being commonly used like this throughout society. It's only used in informal settings, e.g. between friends/family/colleague (AFAIK), and has little to no meaning outside specific contexts. It is, for instance, also used when joshing a person (with either teaseful or unpleasant intent) by proposing they should leave (the room or building): the phrase "ga jij maar even uitwaaien" means "(you should) go outside". When a cyclist informs a partner/friend/colleague about their intent to leave for (outdoor) cycling by saying "ik ga even uitwaaien". Hence I too am a bit surprised about this article.
