What’s the deal with this Jeff Nippard guy?

https://www.instagram.com/p/DBaC0TYJYtF/?igsh=MWN0am81c3ZieXU2bg==

Keep hearing everywhere about this Jeff Nippard guy, apparently he’s a fitness YouTuber and other influencers have come out saying he has no idea what he’s talking about. Now all over twitter and Instagram I’m seeing posts about him being assaulted ??? Does anyone have more information on this?