If a player cheats then the team cheated, and when a team cheats the team is penalised in any sport. That possibly impacts innocent team members, which isn't unusual.
If the only punishment is loss of the ill-gotten points then that isn't much of a penalty. Even if it drops a team out of the top three we don't know that they would have qualified without cheating.
If the penalty is considered unfair to other players then an approach could be to restrict the team to five boards in remaining rounds - the innocent players aren't held accountable for the guilty board, but they can't get a benefit from it either. That still leaves the problem that a team that cheated progresses at the expense of another, which isn't a good look for the sport.
(For the purpose of discussion I'm accepting that cheating occurred, or if you prefer considering it hypothetically.)