This is one reason why I am VERY skeptical of this conclusion. From my reading of the article, the primary evidence they have is a bright radar reflection. Tha

This is one reason why I am VERY skeptical of this conclusion. From my reading of the article, the primary evidence they have is a bright radar reflection. That is the long-wavelength equivalent of saying "we found some white stuff, it's probably water ice!" There are other things besides water which reflect strongly. The fact that the conditions at the site are extremely non-conducive to liquid water tempers the idea that there's water there. AFAICT, there is nothing null-hypothesis rejecting here. In fact, it seems barely as good as "it's not impossible that it's water." I suspect the current hoopla is premature at best.