TV had a limited capacity to mess kids up and it largely didn't. Youtube and the internet on then other hand are in the vast majority of kids pockets with 0 restrictions.
Reading the first hand reports of what this looks like from /r/teachers will black pill you on the future quicker than any post on climate change or war.
The recent rise in home-schooling, and anti-intellectualism probably aren't helping much either, especially when you see things floating about here and there about how schools are hell-bent on brainwashing your children, and you should pull them out lest they be exposed to communism and the moral degradation of society or some such.
COVID does seem to be a part of it, but not all of it, since some of the data linked in the article shows a small decline in the scores before the pandemic and lockdowns. They could well have just exacerbated the underlying issues.
Part of me is glad that my continuing insistence that younger generations are dumber than I was at their age is not just me being an old man mad at kids for still having the youth that he squandered. A larger part of me is terrified at the prospect of a generation being continuously microdosed with levels of garbage entertainment and misinformation that would make George Orwell nauseous.
Seems a difficult these days. I saw my niece last year who was in kindergarten at the time, and she was given a tablet by her school where she did all her homework and homework related video games. She’s also recently started learning photoshop and she’s 6 now. The way humans interact with technology will always keep changing. Some bas, some good.