While you didnt say that your disqualification was wrong, you seem to undermine the advantage you had here, it does not matter the quality of your game, it could be godlike or dogshit, you said you finished the game 2 days before the jam, you FINISHED it, not even STARTED it 2 days before the jam, which is already violating the rules of the jam, the point of the jam is to make a game in the 7 day window of the jam, it is not "questionable".
Allowing a violation in the rules just because your game didnt have a chance at winning, is to set a precedent that the rules are malleable. I do not intend to demonise you in any way, just stating why you were disqualified, and to deter you from doing this same thing in the future