It does to a point.

The OP's link after .html: ?_r=0

Your link after .html: ?module=Notification&version=BreakingNews&region=FixedTop&action=Click&contentCollection=BreakingNews&contentID=50913528&pgtype=Homepage

The 3rd link after .html: ?referrer=

In this case, while the links may lead to the same article, they are NOT the SAME link.

edited: to make url differences more visible

The URLs are slightly different, this post uses: http://www.nytimes.com/2015/09/19/business/volkswagen-is-ord...

Your submission uses: http://www.nytimes.com/2015/09/19/business/volkswagen-is-ord...

The urls are different for the one you submitted and OPs. Generally if you can remove extra query string params in the submission it helps the filter / deduper work better.

As I understand it, the new policy at HN is to allow duplicate posts to make sure enough readers see the article. I used to check for duplicates before posting, but now I don't bother.