I think that Kronos must /hate/ to see the products of Man's creative work so staunchly resist the forces of time, decay and entropy. Especially if this is a town in which he holds a Tether -- it is a blatant slap in his face.
Would Demons of Fate have tried to destroy the rides -- or at least make people think they are unsafe?
Is the Pope Catholic?
The park must have some strong protectors. Perhaps there is a Cherub of Creation, Protection or Children attuned to the rides.
By the way, I think it is better if these rides are /not/ artifacts or anything supernatural at all. It strikes me as much nicer if their longevity is due to simple, human care and labour.