Well, I didn't read the whole article, but I can confirm that I like my daughter (14) better once her allocated phone time is up each day. She only just got the phone 6 months ago, and we limit screen time pretty severely with Google Family Link, so we think we're doing ok. We have discussed trimming the screen time down even more, since school finished up. Also, she's not doing any social media at all. Still, kids are more fun when they aren't staring at a screen (in my opinion and possibly contrary to what many believe).
I think this is obvious to any parent, right? Too much screen time bad. I know it's bad for me as well, though my current bias is heavily against technology in general - I will admit that.