The video is free, but you have to have an account and be logged onto their site. If you don't have an account, I believe you can do so for free, just register for an account.
As SL has said, all ATF videos are free. So if you missed the race and wanted to see highlights and commentary, it's not a bad substitute.
http://www.motogp.com/en/videos/2016/04/11/after-the-flag-3-lessons-in-sportsmanship-from-austin/198511