Aruba is not its own country. Although the official term for it is a 'constituent country', it functions more or less as a state of the Netherlands. In many areas of government, including education, it is autonomous, but it is not at all independent of the Netherlands. Curacao has voted to go this same route ('status aparte'), as has Sint Maarten. Bonaire, Saba and Statia, on the other hand, will have closer ties to the Netherlands than they do now and will exist as Dutch municipalities (like a town or city in the US).

No one knows yet exactly how it will all work, but my point in mentioning all this is that what this says to me is that, like Aruba, Curacao would have the right to grant a charter. Whether or not they will is a different matter of course. Slightly off-topic, but I would think schools on Bonaire, Saba and Statia may be at risk in terms of having to conform to Dutch standards...