You could also highlight the previous sentence:
Every person holding the nationality of a Member State shall be a citizen of the Union
That could be an easy ground for removal.
edit:
The part you quoted merely indicates that citizenship of the union is an additional set of rights for citizens from Members States. Being a citizen from a member state is the pre-condition here.
I think the Dutch court just decided that it was far out of its jurisdiction to rule on this, but thought it would be a good thing to clarify once and for all at the EU level.
The CJEU does preliminary rulings where it is requested to interpret the law. This case might end there.