K-12 in the US was heavily influenced by Prussian ideology, to turn schools into factories of subordinate, authority-fearing citizens. It’s why schools are filled with abusive, inept tyrants that bore kids to tears and often scar them so much that they’ll never take interest in things like math or literature.
Germany heavily influenced American government and institutions (schooling, esp. the academy which usually ends up pushing cultural changes and crafting institutions when they become administrators) during the 19th up to early 20th century. I think it's short-sighted to say that (which she does in the article you linked) because schools aren't exact replicas of factories, the Prussian influence idea is completely unfounded history.
“I think the big mistake in schools is trying to teach children anything, and by using fear as the basic motivation. Fear of getting failing grades, fear of not staying with your class, etc. Interest can produce learning on a scale compared to fear as a nuclear explosion to a firecracker.”