Great shot, 17 years ago I predicted that within 10 years you would not be able to tell the real from the computer generated. This is the first screen shot that qualifies IMHO, because this comes damn close to looking real.
Unfortunately they didn't have a screenshot of Forza running at Ultra level settings, which is mentioned in the article as being achievable, because I think the line would be blurred even further.
I hope Ultra level settings add a fair bit b/c the aliasing on that screenshot is incredibly obvious everywhere but especially on the cables holding the starting lights and the barrier fences. It looks good but it isn't real by a long shot.
I see it when you mention it, but it did not standout for me by any means. And it might be an artifact if the image is being downsize automatically for you to view it (I know it was for me).