There is rules about how you can select players, how much, when if you want to avoid penality.
I don't understand this sentence on the context discussed.
That player should have not been allowed to be peeked without his manager acceptance.
If he was NT-legit, then it was a whole new ball-game, but he is not, and will never be. [and is not for a few seasons]
It is even not my player! I am not acting for my own benefit but for the benefit of the game.
What you define as "corruption" is not corruption.
I'll rephrase;
It might be or might not be a corruption
It is still something that might give unfair advantage and should be avoided.
And easily could be