He added this update:
> This articles was "flagged" by Hacker News about 90 minutes after I posted it there
I regularly get HN posts in my RSS feed that end up being flagged when I click through to them, but this url has only been submitted once from what I can tell. Plus, even if it had, adding "flagged" to the title of a post is far from censorship.
I'm not sure why he thinks HN is removing his posts.