I think HN automatically removes certain words like "This" and "How" from the start of titles. But this only happens on initial submission - the user who submitted it can then edit the title to fix it if necessary.
It's quite bad system, original article use actually normal title These CGI Renders Are Actually Real Photos.
Yeah, cutting the 'these' completely changed my expectations for the article. Without it, it sounds like it'd be a rant about the relative artistic validity of photography and CGI.