It's a hard thought line to follow, if this win is tainted, most wins are tainted.
As a FC Barcelona fan, it's fair to recognize that the club had a great push even from the day of its creation, with a bunch of wealthy businessmen getting together to fund the club, helping with their personal wealth and contacts in many milestones at the start of the sport in Spain, while other teams had to share pitch and shirts.
For city, is yet again a group of wealthy owners (who also own a state) putting money and contacts into the club.
The difference is that now there were supposed to be laws to prevent this from happening, still, those laws never leveled the field for clubs created before FFP, and who profited from wealthy owners building their history in the 100 years before the laws were created.
How much time needs a club to rake in the profit of a scandal before their trophies are fair again? Atletico de Madrid were to be relegated in the last La Liga season before the Spanish Civil war, they were merged with the Air Force team that couldn't compete by their own right at the top tier in the war/post-war, they managed to secure their spot because Real Oviedo's pitch was unusable (was employed as an arsenal for the military) and couldn't play, to make things even better, Atletico de Madrid, who shouldn't be in the top tier, and was merged with a military club in a dictatorship, won the first two titles after the competition was restarted post-war.
It's even worse than the City situation, so what do we do with them, are their titles still tainted? Where was the point they returned to be 'legit' again? Where would they be today if they didn't get help to bounce back, would they even exist?