Flanders in general does not want to join the Netherlands. Remember that the Netherlands did absorb Flanders from 1815 to 1830.
Though they speak dialects of the same language, the two people are distinct enough that they want to stay apart.
A separate Flemish nation within the EU is very viable.
Fair, and I’ll admit I’m not coming at this with any great knowledge of local conditions. It’s a mostly tongue-in-cheek observation of things from a big picture geopolitics view. I will say I did find Pilsner’s comment quite interesting, and generally supportive of the idea, at least on the surface.