I think it's more that his comment did not contribute to the conversation in any way, as per HN guidelines. The idea is to keep the threads as clean of superfluous answers as possible.
I added the comment as it is a clear omission and did not get revised by moderators. open source feels like to draw people in, but then you find out it is platform specific/mac-only. If this was there, it would have saved me and others time by ignoring it.