Came across the exact same thing recently, when a commenter on http://bentilly.blogspot.com/2012/10/my-sons-flashcard-routine.html mentioned "Why Johnny Can't Read". Pretty much the first Google hit: https://www.forbes.com/sites/nataliewexler/2018/05/19/why-johnny-still-cant-read-and-what-to-do-about-it/