Wrong end of the stick
Sorry Lewis, this changes nothing about the possibility of mining ice at the Lunar poles.
This research has nothing to do with asteroidal or cometary water on the Moon; it's to do with primordial composition of the Moon's Mantle where the lunar basalts originated. Essentially they were asking the question 'was water present when the Moon was largely molten?'
And the answer appears to be 'no'. It confirms what has long been suspected - the lunar interior doesn't seem to contain much dissolved water - unlike the Earth. It also helps support the theory that the Moon was formed when something about the size of Mars hit a partially differentiated protoEarth, splashing off a lot of the less-dense, metal poor Mantle and whacked up the temperature to the point that anything with a low vapourisation point was boiled away. Since Apollo brought back lunar samples there's been quite a lot of evidence that the Moon was water-poor and had a high temperature origin, this helps confirm it.
There might well be ice at the poles or at isolated places in the regolith, but that will have arrived later in comets rather than come up from below.