No, this is just about right. The evidence they have points sharply to there being a ninth planet. Now they're saying "here's where it might be, we need help fi

No, this is just about right. The evidence they have points sharply to there being a ninth planet. Now they're saying "here's where it might be, we need help finding it!" Once someone has a photo and an orbit, that'll be the >>3.8sigma you want, but I don't think anyone is saying anything like that yet. What they're saying is "dedicating 5 years of the pinnacle of your planetary astronomy career to looking for this thing is probably not a waste." They directly compare this to the theoretical prediction of Neptune, so I think the authors have this same interpretation of what they are doing.