My dude, I don’t know how to explain this to you but phones and computers are addictive for people. They get hooked on them to feed the lizard brain with digital junk food engineered for engagement.
Manipulating "studies" doesn't help reveal how true this is (or even if it is, do we perhaps have an inherent level of addiction and phones are just an easy target?), nor help find effective ways to reduce it.
That’s irrelevant to the issue with the study that the parent identified.