It did go through peer review, meaning that, if repeatable, the results were science. In that case, a whole lot of people were skeptical enough of the extraordinary claims that they decided to check the results themselves, and those results failed the test of reproducibility. As has been alluded to already, peer review is necessary for something to be considered science, but it is not necessarily sufficient. All kinds of crappy articles get through peer review, but, usually, only other specialists in the particular sub-discipline they are written in are in a position to determine this. If the article is only of interest to people in that discipline, word will get around, and it usually ends with that. If, as in the case of cold fusion, it is of interest to the general public, other scientists generally take the time to debunk it.