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[Verjigorm]

I would say that in my opinion, the restriction of "No fortifying Victory Points" is unconditional, which means you should have to destroy the castle. That's my opinion. The idea that you could fortify a victory point makes it more difficult for others to acquire it, and such is the basic purpose of the restriction, so it should not matter whether or not you are receiving VPs for the point.

The restriction is simple and clear. Unconditionally, no fortifying victory point provinces. Thus the fortress should be destroyed, unconditionally and no payment even of VPs should prevent said destruction.

That's just my opinion.