Coutinho had been on Inter's books for four or five years by the time this happened, he wasn't exactly an unknown kid from the Brazilian second division, and we have no idea if he was involved anyway.
I agree with you all that what they did was bad, but I guess I just don't know what the ask is. I saw the initial story in the Times spread about a decent amount, and have seen some smaller follow on stories, but beyond that there just might not be much to investigate. It happened six years ago and was settled. Liverpool aren't going to talk about it, and if City aren't giving anything where do you go from there? If City felt it was as big a deal as we're making here surely they would've alerted the authorities back when it happened, or fed some reporters either then or now, but instead they accepted £1m to sweep it under the rug.