No , they are just ensuring that they will not be put on trial by social media. There are very well functioning institutions to deal with such incidents inside the Dutch system without adding twitter and Facebook ..
It is not limited to ATC by the way , he same goes for CVRs
Similar procedures and actions exists in many modern States (e.g Canad or New Zealand) where safety management is more important that journalist sensationalism...
You can't get away with that over here. We have leakers and the news is free to post hearsay as fact