The voiceover mentions the result (2,3 in the side, position on the 1) which obviously has nothing to do with using the bridge to break with. Those outcomes are standard for a center table break with a magic rack.
It must be mechanical. He feels it gives him a more solid action for his break, and provides a certain amount of elevation for him to get some pop and forward momentum on the cueball. Maybe it allows him to stay more upright with his body because he’s not having to get down to his bridge arm and hand? Maybe that frees up his cue arm?
He certainly didn’t always have good outcomes when he was doping (EDIT: LOL, doping rarely has good outcomes. Typo: doing) it, but it did make me piss myself laughing.