Yep, it seems the lenient dupe detector is the culprit (and it also seems my tin foil hat is on a wee bit too tight).

Anyhow, I'm still curious if HN has gotten any DMCA notices?

I think I grabbed the link from share and rdl grabbed the url from the location bar. When I noticed the dupe I considered deleting the post but that did not seem like the right thing to do because its not my place to remove other peoples comments.

Yeah, I felt bad because you had better comments, so I was considering deleting mine too, but I'm trying to hit #63 on karma...

Personally I think karma should be based on comments only. I have bookmark's for agl, rdl, tptacek, etc's comments, not submissions. If it is any consolation there are a few people ahead of you on the list that are essentially link spammers. Anyone can submit links all day and accumulate karma. That someone was first to file a story does not signal a lot of information in my opinion. Keep up the good comments and I am sure that you will continue to move up the list.