The guy at the back seen pushing/ signalling the man in the aisle in front of him to go is the one who ends up on stage with a long grey coat on. He was prompting the black guy wearing a yellow hoodie, who also ends-up on stage. They were together. Another tw*t wearing a red hoodie and yet another guy ran down the stairs and on to the stage immediately behind the first two. It's all on the internet (in video form from audience members) if you want to find it.
Conclusion: the bloke doing the pushing was the main protaganist of the stage invaders/ prankster group. Although it's extremely unlikely, that doesn't mean the whole thing wasn't set-up in order to hype the show/ Honey G (or perhaps even for Simon to undermine her and get rid-of her now), however the person seen doing the pushing was NOT production staff.
It was a planned event, yes, but by four blokes who thought they were being funny, almost certainly not by anyone connected to the show.