I still do no see any causal link from the test set. When was this observed, how and by whom?
Are you trying to say that the person who entered the parameters had access to the test set? I find it more likely that they encoded the generalising rule than observed every instance of its use.
>I find it more likely that they encoded the generalising rule..
Look, I am saying that during training the model ends up "learning" the generalising rule from training data, but here it was explicitly entered into it, with out any training.