This was obviously a video/social media stunt. Neither logic nor intelligence was involved; however, it was a pretty cool video. As one who has hand propped a Champ 7AC many times, it was interesting that the prop blade was in just the right position for a hand "nudge". I'm sure that the subject airplane was not equipped with an electrical system and a starter ... right? Other than that, a shoo-in for a Darwin Award!
Cheers,
Grog