Yes. Saying it yet another way, the ballot is fraudulent no matter what. All that can be done with it is subtract it from one side or the other side. There is an argument that some of the ballots cast illegally went to McDaniel, if for no reason other than voter error! The illegality of the ballot is independent of who it was cast for.
You can’t just arbitrarily subtract it from one side or the other. And you can’t throw the ballot out because it isn’t tied in anyway to the illegal voter. (its a secret ballot) The best we can hope for is there are enough illegal votes (more than the margin of victory) that it warrants a “re-do” in the election. That is all we can hope for.