Not sure how the article can state it so conclusively. See e.g How Much Mightier Is the Pen than the Keyboard
for Note-Taking? A Replication and Extension of Mueller
and Oppenheimer (2014) [1] and Don’t Ditch the Laptop Just Yet: a Direct Replication of Mueller and Oppenheimer’s (2014) Study 1 Plus Mini Meta-Analyses Across Similar Studies [2]
There's quite a bit of variance, and the early results may have been biased by the fact that have a laptop and typing while taking notes were relatively new things.
1 https://link.springer.com/article/10.1007/s10648-019-09468-2
2 https://journals.sagepub.com/doi/10.1177/0956797620965541
There's quite a bit of variance, and the early results may have been biased by the fact that have a laptop and typing while taking notes were relatively new things.