he's a department of defense contractor and war physicist whose math has been used to kill people around the world for his entire career, and his simulation theory, in which his existence is infinitely repeated until he gets it right, is a psychological release valve for his bad conscience about everything he has done in this life
in my opinion
somewhat interesting not really
on the other hand, i haven't read the book, i just listened to a podcast about it
But if the simulation is real, the book doesn't even actually exist until it's in your hand anyway so it's all good