Another bit of evidence is unruly passenger reports from airlines [1]. There's a kind of mass PTSD / trauma response at work re covid that causes people to shy away from the obvious facts about its effects on us.
That said, these test score effects are the result of many factors, only one of which is likely mild neurological damage.
I for sure assume this is a multi-factorial problem, with COVID impacts being one of many. I understand why people are reluctant to acknowledge and discuss this. It would make repeated COVID infections a terrifying prospect.
I had heard about the increase in rage outbursts, but hadn't seen the unruly passenger data. Interesting! (And not in a good way)
That said, these test score effects are the result of many factors, only one of which is likely mild neurological damage.
[1] https://x.com/AlecStapp/status/1864990443567562890