The thing is, we can't DO anything about the boosted stats. There is no way to determine who boosted and who didn't, and how much they actually boosted.
The only resolution would be to just reset everyone, and that's not going to happen.
Also, since this boosting is no longer taking place(hopefully, and if it is we CAN find them now and reset their kills) it's no longer a factor. If anything the other players may not know who is legit or not and it gives them a goal to pass. Eventually as time passes these stats will be normalized as the legit values catch up.