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The Distribution of Users’ Computer Skills: Worse Than You Think (2016)
(www.nngroup.com)
This is a most excellent place for technology news and articles.
Because you said that was not the point of the article and I asked you to clarify why you think it wasn't. But never mind. This is going nowhere.
Bad phrasing. I read your previous comment as demanding an explanation from me for why the author wrote an article about simple design rather than about user testing.
Honestly, I don't think the article would have been well-served by detouring into user testing. It's long enough as it is, and again -- NN group has written a LOT on the topic.
I'm not really sure why you brought it up in the first place. It seems like 'beating a dead horse' territory.