Nothing to do with the crowd, moreso the low level waiver for the safety of the pilot. A couple of years back they (CASA) weren't renewing ground level waivers but seem to have slowly give them back again. Sure, accidents can happen but by dropping the ground level waivers the chances of incident are reduced, including this accident. It was the Moon and Boorman fatalities that instigated the last changes.
Looking at that footage he is bloody unlucky to have received any significant injuries.
We need our resident low level stall crash expert, Planky. My 2 cents says that the engine cut out in the climb but hard to know if a. The pushover was intentional at that altitude and b. With the speed of sound, did it actually cut out in the climb. Without having seen the routine prior, it would be hard to know.