Earlier quoted context omitted.
Not necessarily. Wealthier parents are more mobile, and can move residences such that their children are in the top 10%.
It seems like you are arguing that wealthy parents move to places with worse schools to make it easier for their kids to be in the top 10%.
They'll often go straight for petroleum engineering if their career path is as calculated during college as it was in high school, and end up with a six figure salaxy at age 22 (not sure this still works as of 2020 given the problems with Houston's gas sector).
For some parents, making sure their child has a sure fire path to the middle class is what they consider their main responsibility, and will do things as crazy as move to a worse school district just to get them on the above track.
If you're as cynical about the value of education (to provide a "job") as the people described, you'll absolutely sacrifice the quality of your kids education (moving to a school with ostensibly less talented or credentialed teachers and possibly less academically gifted peers to learn from and larger class sizes) in order to game the system.