Indeed, I thought that "decades old" sounds like an underestimate there: Socrates is said to have criticized writing for letting people to not train their memory, so that would be millennia by now. Though of course it is possible that the article's author would not agree with that, and would have a beef with more easily searchable content only, like the people who criticized tables of contents. I do not mean that they were all wrong though: probably the degree to which knowledge is outsourced matters, maybe some transitions were more worthwhile than others, and possibly something was indeed lost with those.

>Socrates is said to have criticized writing for letting people to not train their memory

And he likely had a point. What I recently noticed is that my father, who had very little formal education but happened to have very old-school teachers who hammered him with memorizing a lot of poetry, which he continued in adult life, is more verbally fluent somehow than a lot of young kids who don't have command of grammar any more. ("would of")

Granted they likely don't write or read much either but directionally if you keep outsourcing mental work, you degrade. When I studied Japanese I liked the term a teacher had for his defense of memorizing Kanji by handwriting, which he called "neuro-muscular". Like playing scales on the guitar or piano there is something that keeps you snappy in memorization and rote practice that goes away if you only passively search.