No, the data from the Dutch portal cannot be deleted. Your details are in the portal because you are legally obliged to file a notification in the portal under the Posted Workers in the European Union (Working Conditions) Act (WagwEU).
Since 1 June 2022, in almost all cases you are required to file a notification in the European portal. on the page 'what constitutes posting'.
Postings that you should continue to file a notification for in the Dutch notification portal:- Intra-group company postingsThat is if you post one of your employees to a branch of the same group or concern in another country.
- Temporary employment by a foreign temporary employment agency- Cross-border transport operations by a self-employed driver based abroad.