Note that the research was conducted before 1989. "People who don't know how to use a computer" was approximately everyone.
Re:Going mouseless
by dredmorbius on Wednesday August 04, 2021 @10:15PM
(#28068986)
It still is, and likely will be for quite some time.
OECD Skills Studies > Skills Matter
http://dx.doi.org/10.1787/9789264258051-en
https://www.nngroup.com/articles/computer-skill-levels/
https://old.reddit.com/r/dredmorbius/comments/69wk8y/the_tyr...
Perhaps the key takeaway is that Apple optimizes interfaces for people who don't know how to use a computer.