How close have the Royalty ever come to (finding out about) EU?
They haven’t, thus far. The relationship between the Royalty and the soft spots of our world is similar to something huge and predatory in the abyssopelagic zone of the ocean where light cannot reach, and tidal pools. Both are technically still the ocean, but so distant that one has no bearing on the other. Even if the Royalty were informed somehow about the University, it’s unlikely they would care much at this point in time.