Demonstrably not true. There are plenty of people with poor parental role models who did well in school and broke the cycle.
Technology drops the threshold that the disadvantaged students have to overcome. Whereas before they needed to be lucky enough to have a great school library or transportation to the municipal libraries every time they wanted to go, now they just need internet access. Governments and schools can't do anything to give the kids motivation or better parents, but they can work on the technology angle and remove more barriers to success. There will never be a single solution to the myriad of problems facing education - this is marathon that requires solving one problem at a time.
I think it takes something special to truly break the cycle and move upwards. I don’t see many people do it. Then again, I came from one of the worst schools and towns in my state and now live in SV where everyone was a rich kid. I check Facebook to see if any alumni from my HS ever got anywhere. Nope...
Let's put it this way
1) motivated parents with poor school funding = most likely success
2) unmotivated parents with great school funding = demonstratably bad outcome