This understandably made people unhappy at the host school - ~7% of the class is academic high achievers from out of the school zone who take most of the admission spots reserved for the top N%.
I don't know of any cases of parents moving to avoid the extra competition, but I probably wouldn't have heard of that if it happened. I do know of some people set on going to UT who did not apply to the magnet program so they could have less competition.
The point here is you don't need to move to a rural area to decrease school competition. There are plenty of cases where you can move a mile to get into the zone of a less competitive school.
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.
Nobody with money goes out of their way to send their children to a school in a 'common' part of town, because they don't want their children to mix up with 'the wrong kind' of people.
Why should my chance of getting into college be hampered by where my parents live or what color skin they gave me??
Aiding one person is inherently discriminating against another.
Why should theirs be hampered by the same?