Like for a personal parallel, it would probably be wrong to announce to a friend that you thought they were ugly, no matter how correct you were.
The sincere apology would have been to announce that his answer was incorrect - otherwise he is just trying to pacify the mob, if that makes sense. Perhaps I'm being a little pedantic, but this email has clearly been proofread by a number of people, and the key statement is definitely not as clear-cut as this HN thread seems to be deciding (it's a very clear-cut non-statement).
Edit: Criticism definitely fair, I jumped to conclusions.
I think you are reading more into this than is really there.
I'm sure you didn't mean anything by your choice of words but perhaps using "influenced by" or "derives from" would be better.
The juxtaposition of this 'right advice' with the previous 'wrong answer' should indicate to you his current position on the matter. Speech is a lossy serialization of thought. It depends on our reconstructing context.
Sounds like an unambiguous repudiation of his previous answer to me.
EDIT: Just noticed geetee made the same comment. Didn't mean to steal it.