The point is “CAS has to show reservation or restraint in evaluating whether a sanction is appropriate; the measure of the sanction imposed by a disciplinary body in the exercise of the discretion allowed by the relevant rule can be reviewed only when the sanction is evidently and grossly disproportionate to the offence”
https://jurisprudence.tas-cas.org/Shared Documents/3944.pdf
If City are found to have breached again after a settlement there is no realistic prospect CAS will interfere. Especially not for such serious allegations.