Ok, so I think I see the difference between all the plays mentioned in this thread. So if two players go in motion at the exact same time and don't stop, illegal motion per 7-2-7.
If two players go in motion and one of them resets, then it's an illegal shift per 7-2-6.
As for the video (I can't see it they block the site here at school), if I remember correctly, that's the play where the QB goes under center when the motion man goes in motion. Based on where my understanding of things thus far (which is a little shaky to say the least
) I believe this is an illegal shift. This was a POE this year, correct?