No one says adults are immune to it, we also have less neuroplasticity - I can imagine that if I’d had more screen time growing up, while my brain was developing, it would have had more of an impact on me. That’s not to say it’s all bad, I think like most anything else we need to approach it with moderation especially when it comes to children.

The post you are trying to refute has a source which is a study that found "It can obstruct the ability to interpret emotions, fuel aggressive conduct, and harm one's psychological health in general."