I immediately thought of Asimov's essay when I read that too, so I'm not surprised someone else posted it.
Of the two, I think Asimov's is much better (if only because the Fallacy of Grey relies too much on analogy).
Asimov's essay is explicitly referenced at the end of Yudkowsky's, so I'm really not surprised someone else posted it.
Yes, that generally seems to be the case with HN postings. I've noticed that interesting links from articles or comments in those articles posted on HN often become new HN postings.