You should have complained to pg. I had a similar thing happen on a digg blog post, and he reinstated it.

idem... killed even mine: http://news.ycombinator.com/item?id=1541119

But which are the rules that autokill a submission? I can understand simple duplicate removal, but then?

Interesting... mine was killed as well. http://news.ycombinator.com/item?id=1539911