There's a whole section at the end with his theories about why you could expect someone like him to get this better than the experts (the experts were too busy

There's a whole section at the end with his theories about why you could expect someone like him to get this better than the experts (the experts were too busy managing the intricacies of Plan A instead of constantly rigorously checking that its assumptions still held and whether it was time to give up and switch to Plan B, etc), and he makes a point against having too much modesty like he did if you have good data.