Please don't post comments like this to HN. WildUtah's comment may (or may not) have been overstated, but yours is mean.
Seeking to cast another person in the stupidest possible light is a form of incivility. The precedent it sets for others gets worse the more right you are.
So you've discovered that one data point in a set is not precisely equal to the average of the set.
And you think that means...."loses all credibility".
Oh boy.