SCOTUS has exclusive original jurisdiction for state v state complaints. This means that the plaintiff *has* to bring it to SCOTUS because there is no possible alternative venue. So... if they do not agree that this is indeed a state v state complaint, and that there is no other possible venue, then they may accept it. Otherwise, it will get punted to a lower court to deal with it. This does not mean they think it is bogus, just that they are not the right venue.
Again though, it means nothing about the merits. It simply would mean Texas filed the case with the wrong court. We shall see.