I thought the same thing, but if you wait around, you'll see that the ad is a pre-roll to a TV news story about the Afghanistan story. So it's not really an auto-playing ad, it's an auto-playing news video with an ad in the front. Still annoying.
So I wondered why I didn't get an autoplay story, then I realized it's on ABC and last week I had ad block plus create an easy filter to get rid of their videos entirely. As far as I can tell, losing ABC videos is just not a loss, and it leaves a static jpg that ABC presents to browsers that can't do video.
What I've been curious about is can sites tell when someone has started playing a video, but clicked away from their precious video after a second or two?
Edit: "video ads" -> "videos" I don't like either one.