NASA's Interstellar Boundary Explorer (IBEX) spacecraft has made the first observations of fast hydrogen atoms coming from the moon, following decades of speculation and searching for their existence.** Launched last October, the IBEX has a mission to image and map the dynamic interactions caused by the hot solar wind slamming into the cold expanse of [...]

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So, that seems to me to make it certain that there's water on the Moon, then. We already know there's oxygen, and now we have proof of hydrogen. Am I wrong here?

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Yes , it has been hypothesized that there is very small amount of water on the moon. Due to recombination between these H+ ions and Oxygen of the ground. More on the far side , because it is lower than the near side.