Aristotle's conception of the goodness of a thing (which is not convincingly conveyed by the author) is essentially normatively neutral; a good knife qua knife for Aristotle is one that cuts well as a good nuclear weapon is one which is destructive. Using a nuclear weapon might not be good but just as a gun might be well-designed without being well-used I don't think it is too normatively concerning to be able to identify something as being a good example of its kind (a well-designed nuclear weapon), though I could be wrong!