It is in the style of the original, where during Covid the page on “Migrating to the Netherlands” simply just started with “Do not migrate to the Netherlands”, before expanding on the Covid restrictions on place and what foreign nationals currently in the Netherlands are to do.
On one hand: Now that’s loud & clear communication. On the other hand, “Just don’t” really ties in to the stereotype of Dutch directness/rudeness.
That’s correct, 敬語 perfectly follows the rules, but while there are rules for 普通体 (ある instead of あります), people mostly just talk in whatever way they want that does not follow any rules.
It’s quite shocking to me as a Dutch person, we hardly have such a big difference between formal and informal Dutch