Utter rubbish, designed as clickbait for older folks. Every generations dunks on the next one, right up until it's time to change the clock on the VCR and only the kids can do that.

Kids are growing up in a different world than we did. They need different skills, and probably a different cognition. Teaching them to deal with rapid attention shifts is probably going to equip them better for their actual lives than trying to make them focus on one subject for hours.