By the same token, we have never detected Hydrogen at all, only neutrons (and the lack of them).
We have pretty good reasoning stating that the neutron data correlates well to Hydrogen.
The piece I read on this study implied that we have pretty good reasoning stating that this polarization method also correlates well to Hydrogen (does it? - I do not know anything about this method).
If everyone's reasoning concerning the two methods is close to true, and the claims about the resolution of this polarization method is true, then the conclusion drawn by the piece (and the study, if the piece on it was accurate) is a reasonable one. No?