He claims to have used a 60% hit rate, but I really don't see how he's calculated his baseline damage.
He's got something like a +2 to damage from level 1 to level 2 which means it has to be a Paladin or Ranger as his baseline since they get the fighting style boost at level 2. But it can't be either Paladin or Ranger as there's a significant damage boost at level 17 when they get no new abilities only extra spell slots.
So there's definitely something fishy with his baseline damage.