I don't see any reason why someone would go to the trouble of making that up. I watched that happen hundreds of times a day, every day, when I first started spraying. Flagging (I may be dating my activities, there), we would stand at the end of the field and wave a flat for the person doing the work to line up on. We would stand there until he was close enough, and then either duck down or move off to the side a wingspan.
We got used to an aircraft passing over like that every minute or so, all day. I have photographs snapped as I was falling backward on a dyke looking into the prop, up close and personal...glued in my logbook.
I did the same thing from the cockpit, too. I still do. Why would someone go to the trouble of falsifying a video of a low pass when it's just as easy to go fly it and film it, and be done with it? It's not exactly rocket science (more an art).
You can clearly see the spit pull as it reaches the reporter; his ducking makes it appear as though he needed to. He didn't. The spit was well clear of him when it passed over the reporter, and photographer.