I think this article would be much better if it didn't focus on the tool, but on the content. As you mention, it's attention that's so damn detrimental. I've heard the term "dopamine-hacking" more than a few time over the last year to describe what Facetwitstagram are doing to us.
Our apps have trained us that we never need to be bored, if we can instead be distracted by them. Youtube's algorithms are optimised to make you watch longer. Whether that time is enjoyable, engaging, interesting or informative doesn't matter.