That’s not surprising. It’s easy to show that something is ineffective when the organization implementing it wants it to fail. Many teachers will actively or passively work to sabotage new ideas. I have the knife wounds in my back to prove that.
The university lecture model was invented before the invention of the printing press, when the only way for a professor to impart knowledge was to stand up and read the book to students. The public-school model was invented in the 19th Century. Modern technology has been allowed into the classroom, reluctantly, provided it’s done in a manner that doesn’t threaten the status quo. The government-education complex was desperate to get students back into the classroom before parents and taxpayers realized how cost-effective home schooling, distance learning, and online education can be.