There are a couple of differences between the two cases in Jones v Bush, that suit would have at most prevented Cheney from serving as vice president. In addition the electors of Texas would be the ones guilty of breaking the law. The problem in this case is that if Obama is not president of the United States he cannot give orders to the military and as a result if a member of the military follows those orders he will be guilty of following an illegal order.
Your link goes to the filing, not to the action of the court. The filing means zip, the order or other action of the court, means everything.
Besides, it a district court, whose precedent only holds in that district, IIRC. If higher courts declined to hear any appeals, that carries no weight of precedent either.