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Your link does not claim that. In fact, their study specifically states: "We only had repeated screen-time and behavior data available for a sub-sample of our cohort (n = 367) which limited our ability to determine directionality. As such, it is possible parents may respond to children who exhibit externalizing behavior difficulties by offering more screen-time or using increased opportunity for screen-time as a self-soothing strategy. "

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It's a fair point. Not a perfect study and they do not claim a causal relationship. However, also from the results:

Researchers found by age 5, children who spent two hours or more per day, looking at screens, were 7.7 times more likely to meet criteria for a diagnosis of attention deficit hyperactivity disorder, or ADHD, than children who watched screens for 30 minutes or less each day.

It's a substantial result. They talk about practical and ethical reasons they can't establish the causal relationship, too.

I'm guilty of being a little tongue in cheek, but I'd try to limit a kid's exposure to early screen time and ease them into things like TikTok.

And you can't "get" ADHD. You either have ADHD or you don't. At least thats what the scientific consensus is right now.

You can have conditions exacerbate the symptoms associated with ADHD.

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