I agree with Stathakis. If WQ was to play say, a random instead of njnp, he might play differently / prepare much less. So if the person njnp ghosted were to lose, the situation is exactly the same as it is now, but if he were to win, then njnp has gained an advantage in the tournament, by cheating. Therefore, the difference between him keeping his trophy is whether they won or not. If the random player were to win instead, and later on njnp plays him instead of WQ, he has an obvious advantage.
There shouldn't be any kind of difference in punishment depending on whether ghostees here won or not. Not only does it compromise the integrity of the tournament, but the action itself could have resulted in very significant differences to njnp's OST run, so while this didn't happen here, the action itself can be considered cheating that could directly give njnp an advantage.
Keeping the trophy seems a rather suspect decision.