Hmm, interesting. Since `border-right` is shorthand, we're saying that `0` as a value is applied to `border-right-width`, `border-right-style`, and `border-right-color`. The `0` value can be applied to `width` but not to the other properties.
I can't speak for the accounts that cropped up posting comments, but I'm the original HN submitter for this article (not the author) and I can assure you there's no blogspamming happening on my part.