Study technique banned in Japan?

[davelab6]

https://youtube.com/shorts/5ISiojtjPTg?si=SnxIKO7Nqp0-6HMb

"Shadow study technique" to read heading text first, no notes, write a summary expected to be wrong, then read the book to write a second summary.

Video click bait says "banned in Japan" and "because it flattened the curve"