OK, I majored in psychology a lifetime ago and I was taught that IQ was pretty much innate. Yes you could lower your IQ via brain damage, but other than that it pretty much stays the same. I can’t see how ChromeBook use could lower kids’ IQs.
That said, being a geezer who taught during the invasion of computers into the classroom, I pretty much avoided using the ‘wonderful’ new technology on offer with my students. I figured that the one thing my kids didn’t lack in their lives was screen time. They need a whole lot more book time. Actually reading books for minutes at a time.
I think IQ is now believed to be both genetic and environmental.
The last I read some time ago, is that behavioral psychologists guess that IQ is about 60/40% innate/environmental.
Your IQ can actually go down if you fail to exercise your brain.
How many people can do simple math in their head anymore?
How many read books? I don’t mean what passes for books written today, but books that took real language skills to produce.