Lots of real estate between "might prefer to deny it" and "untraceable." On HN at least, you should assume the best possible interpretation instead of putting words into mouths.
And yes, malfunction is the most likely cause, distantly followed by attack. Micrometeoroid isn't very likely IMO, considering Intelsat-29e failed similarly. Unless maybe if they painted a red target on it and the meteor god has a sense of humor.