Yes, this is supposedly going to happen according to verifiable tweets by these two lovable fellows.
Mind you, in this reality, it is normal for the owners of 2 mega corporations staking the reputation of their brands - Facebook and Tesla - on the line over an MMA match.
Good luck, to both of you, I guess. Godspeed to the investors.
BBC:
https://www.bbc.com/news/business-65981876
VOX:
https://www.vox.com/culture/2023/6/23/23771769/musk-zuckerberg-cage-match-fight-ufc-mma