On a different level, it seems to be a little hubristic to write a book about the success of your parenting methods when your children are 15 and 13.
When the child is in their 30s is maybe the time to start drawing conclusions about outcomes, but the early teens is still very much a work in progress. What if they bomb their A-levels, or drop out of university, or decide they don't in fact want to be a partner in a Magic Circle law firm?
Very early days to make comment on the success of anything, I think, particularly with a child-rearing method that is so calculated to delay/deny independence and originality. At some point they will start leading independent lives, and the more they've been controlled at an early stage, the more likely they are at some point to react against it, particularly if they're surrounded by American individualistic culture rather than Chinese social norms. I think the same about some of my teenage children's friends who at age 16 are still not allowed to go to sleepovers or to Starbucks -- I want to say to the parents, "You do realise that in 2 years' time they can buy a round-the-world plane ticket and push off for a year without you, don't you think you need to give them a little bit of practice before letting them loose on the world?"