Diabetes & H.pylori - a correlation but no known causation despite authors claims

Am having a hard time right now with the comments from the authors of this new paper showing a correlation between H. pylori presence and both type II diabetes and blood glucose levels.  As far as I can tell, the paper does not show any causal connection.  That is, they do not determine if H. pylori infection is a cause of blood sugar issues or a consequence of blood sugar issues.

Yet the authors of the paper, one of whom (Martin Blaser) is a very respected H. pylori expert are saying things like

“This study provides further evidence of late-in-life cost to having H. pylori,”

And they suggest that antibiotic treatment for the elderly may help prevent diabetes.

This to be seems to be a bit over the top.  Yes, it makes sense that H. pylori could cause these issues.  And they have a model for how it might.  But they really should be more careful with their words until a causal connection is established.  After all, we have many well known negative effects of antibiotic overuse, including some shown by Blaser.  The last thing we need is people going out and dosing up on antibiotics in the hope that it will prevent type II diabetes.  But I can guarantee that is what will happen if this story gets overplayed.

At least a few sources report on the lack of anything showing a causal connection (e.g. see US News and World Report):

An expert not involved with the study said that while it did not show a cause-and-effect relationship between the bacterium and diabetes, the findings suggest certain possibilities

But I am worried that that is not enough skepticism to counteract the claims of the authors here. The study is certainly interesting.  And their model for a causal connection is fine.  But they probably need to do a little bit of toning down of their claims here.