To clarify
Not sure what you think my position is, in this thread. All I'm saying (caveats about radar not working at all on Mars, aside) is that if we get subsurface radar pics, then we may be able to get strong indications of large chunks of ice - if any are there. I make no particular assertions about buried (frozen ) lakes or seas (though the neutron data are tantalizing). I doubt there are large amounts of liquid water anywhere on or under the surface.
But we won't know till the observations are done.
Actually, my original point in the thread was that I thought you were jumping to a conclusion about what Buck meant. I still do, but whatever.