My kids have tablets AND have been involved in dance, tumbling, gymnastics,
tennis, and softball (at different times) and none of them would be able to get close to doing what that kid did. They even frequently play outside! Granted, they're girls, and they have varying levels of coordination, but your assumption that just because you grew up without screens means that half the kids from your generation at that age would be able to do what that kid did is just silly. Many would certainly have tried, and many would have failed.