The following link is what Bill Gates said, 

https://newlearningonline.com/new-learning/chapter-2/supporting-material-2/bill-gates-on-american-schools.

He did talk about how the contemporary school system is not helping kids to get ready for 21st century requirements. The system is also scaling inequality. As a technologists himself, he could see the solution only through the tools of computers. Education is multi-disciplinary faculty and justing rushing only to technology to fill pedagogy gaps is just like turning such an entire system ON and OFF with one button. This sounds horrific.