"banned" is probably the incorrect word.
According to the article, the 12 Dutch-registered Zodiacs have been grounded with immediate effect pending an investigation into its structural strength. Apparently, under normal flight loads the wings can fold.
But you can, PROBABLY, still fly a non-Dutch registered Zodiac in the Netherlands. Legally, that is. Not that it would make the Dutch authorities happy of course, but if your CofA (or Permit) is valid and all other directives from the state of registry have been complied with, there's not much the Dutch authorities can do about it under ICAO regulations.
Also, I don't see any indication that you cannot sell/buy/import/export a Zodiac at this point in time.