Regaining control of your attention doesn't mean not using your phone. It means being self-aware. The author is relying on a crutch. Not using the phone is just removing a single source of distraction, it does nothing to actually help attention regulation. It's like saying, I fixed my impulse issues by never walking in to gas stations, so now I don't have to worry about buying lottery tickets! You didn't fix your imp…
So?
This would be an actionable observation if it was possible for someone with the problem to fix the underlying issues. But neurology just isn't there yet. Until it is, your best bet is crutches like the author uses or:
Alongside getting 9 hours of sleep at the same time every night and 30 minutes of vigorous exercise every day.