I've heard from a lot of teachers saying the same thing. The newer cohorts of students are performing far lower academically and have a lot of behavioral issues.
It's really hard to parse out what's actually happening and what's sensationalism.
My material analysis pet theory is that we're increasingly seeing that dual incomes are necessary to survive. The state does not provide access to childcare. Overworked parents don't have the time to spend and socialize their children. Then kids spend way too much of their developmental years on devices. To me, the devices alone wouldn't be so bad if economic conditions made it easier to actually raise children.
Regardless of what people say about new tech every generation, what we're seeing now is an order of magnitude higher than what we've seen before. The devices and the apps on them are engineered to keep people on them as long as possible. China has recognized this and attempted to limit screen time for young people. Anyone who says that these devices are having no effect on how we process information is unserious.