I was there on the ground, using Street Complete. First I could not locate the "artwork", but I then figured out that the "Cerveau électronique" is placed under the stairs, but currently the shutters are down (see image here: https://fr.wikipedia.org/wiki/Tour_cybern%C3%A9tique_de_Li%C3%A8ge bottom). Several bits around the palais des congrès are fenced off and it appears they're doing maintenance or repairs.

So, nothing to change, but it's still there...