This is not "negotiating". He is sitting at a table by himself. This is called "posturing". The Netherlands holds all of the cards, every single one. Again, the PM can express real or feigned outrage, but at the end of the day, he will do what the Netherlands requires, or there will be no money.
Autonomy and independence are two way streets. Without getting too political, a number of the affected islands have the same issue, including Anguilla. You want to be "independent"? No problem. That means you are on your own, with aid a purely private matter. If I exercise no control over you, then I owe you nothing.