Sounds like a lot. It isn't, though, even if the claim proves up. There is also the Helium 3, which is going to be just as hard to recover. We can go back to the moon, and we can stay permanently. It's just going to take a little preparation.
On the contrary, it is a lot, enough for one Shuttle launch per hour for over 100,000 years! It's roughly equivalent to the volume of the Great Salt Lake.
And there's no dispute that the hydrogen is there -- what's disputed is its physical form, as molecular hydrogen from the solar wind or as water ice from cometary impacts.
Helium-3 is irrelevant -- it's present in much lower abundance levels (~ 1 part-per-BILLION) and anyway, we have no use for it at the moment, there being no fusion reactors that can use it for fuel.