Any research that takes students as an homogenic group is flawed. People can be (more or less) in about one of the 7 different types of learning styles https://www.learning-styles-online.com/overview/.
So making claims like "doing X works better than Y" is meaningless without pointing to a specific learning style.
That's why you hear people defending writing to paper, while others prefer just hearing the lectures or others have better performance while discussing with peers (and some hate all of the other interactions and can perform better by isolating and studying on your own... which is probably the one who will benefit the most of having a laptop available).
debunked is a hard word for "hey, lack of peer review":
"... Coffield's team found that none of the most popular learning style theories had been adequately validated through independent research." - https://en.wikipedia.org/wiki/Learning_styles
sounds more like lack of funding than pseudoscience.
So making claims like "doing X works better than Y" is meaningless without pointing to a specific learning style.
That's why you hear people defending writing to paper, while others prefer just hearing the lectures or others have better performance while discussing with peers (and some hate all of the other interactions and can perform better by isolating and studying on your own... which is probably the one who will benefit the most of having a laptop available).