This, exactly. People are assuming that correlation equals causation here. IQ and critical thinking skills, as well as reading comprehension ability, have been on the decline for quite some time. AI is actually much better at getting things right than the average person who uses google to feed their confirmation bias and find echo chambers in which they can bask. I'm not going to post a bunch of links, because anyone can use the prompt "studies showing IQ and critical thinking in decline" in your "favorite" agentic AI. A hammer, the internet, and AI are three tools equally capable of constructive and destructive uses, and this study just shows that the same trend that started with technology in the hands of the incompetent is merely continuing as expected.