At the root of this turnaround: the idea that mind-wandering is not a waste of attention but simply a different kind of focus.
Could this be the beginning of the revolt against mindfulness?
I think the article (and probably a lot of modern mindfulness courses/books) conflates mindfulness and concentration meditation. One of the basic principles of mindfulness meditation is equanimity. In terms of 'mental objects' this means being non-judgmental towards thoughts, emotions, etc. Wandering is just one of the many things that occur and when one notices wandering, one can just observe that. If the wandering continues, it continues. If the wandering stops, it stops.
Focus can be a side-effect of mindfulness meditation, but is not the goal.