I watched the video and in it you can clearly see at first her hand is under the shoulder, then the young man lifts his right shoulder off the mat, then the official gets in the view as he's looking for the fall, at :50 it appears it could be a fall but we cannot see the other shoulder (but the official is right there) then at :55 he goes back to lifting his left shoulder off.
I didn't see a fall and a video this far away can be deceiving. The official was in good position to see it and apparently didn't see it.
This is just my opinion, probably not worth anything just my view.
