Having a son who I was able to get a diagnosis of ASD at age 8 and who is now 24, these types of articles really bug me. For one the study had 1,000 teens that were researched, but if you read carefully not all were in the autism spectrum.
Since autistic behaviors varies from child to child, even though the teens watch a lot of tv or play video games, that does not mean they are not social. My son's junior high and high school years were the worst for him, (school can be rough for a lot of kids, some kids just get vicious.)
He did stay home 90% of the time because the outside world was a nightmare for him. Yes, he did spend a lot of time watching tv and playing video games, but I've had the policy in place that both the tv and pc are to be in the living room ever since we've had them. But during that time he would talk with me and his sister and go to my parent's house for the weekend.
When he did stop talking to any of us that's when I really started to monitor him, and sometimes it would take a year before he would be able to tell me what had been wrong. Up until he was 19 he allowed me to stay in the room with his psychiatrist so I could fill the doc in. (I'd prepare my son a month ahead of time. He always need time to process things like that).
My point is I'm the expert in my son, not some researcher and every parent I've met who has an autistic child are very involved with them. You have to be whether explaining their behavior to new people or advocating for them.
It seems like this article is suggesting that our autistic children be pushed to be more social. My son's schools tried to and those were miserable years for our family. Would I have liked to see him go out and play more with friends, or the one time he joined a soccer team for half a year sit with the group instead of 15ft. away? YES! It just wasn't possible at that time. He couldn't be forced as it would cause a meltdown.
The best part is as the researchers have discovered as the teens get older they do start communicating more on-line and that's true of my son. He found out he's a wonderful artist (within a week his stuff was unbelievable), and fearlessly posted his artwork on-line. He now chats with other artist all over the world and his artwork often gets "liked" as soon as he posts it.
Go away experts unless you get the whole story from parents.