Mox's story is after he won the world title a few weeks ago and took out Danielson, he declared himself the boss of AEW and that everyone works for him now and that anyone that gets in their way will get destroyed yadda yadda yadda.
Him and his stable the Death Riders (Pac, Claudio, Yuta, and Marina Shafir) started to beat up people on the roster, but it was basically only Orange Cassidy, Darby Allin, and a bunch of lower mid carders like Top Flight and the Dark Order fighting them.
Most of the roster, all of the upper mid carders and main event people aren't involved, aren't acknowledging any of this is going on, and are all doing their own thing and their own feuds.
Basically the story is the World Champion and his stable have "taken over" the company, yet nobody in the company seems to care or are acknowledging it's even happening at all. It's stupid.