With the possibility of unintentionally sounding racist..
“ Gen Z is the first generation in modern history to score lower on standardized tests than the previous one”
The percentage of immigrants or non-native English speakers is also increasing in the US (and in the EU).
Since these groups historically also scored lower, one would expect the general scores at least partially lowered due to this.
Also add in Covid with two years of interrupted lessons and work-from-home, I wouldn’t be so quick to blame this solely on laptops.
Every study like this needs to adjust for common compounding factors; demographics, income, teaching methods, covid...
Otherwise it's junk data, we have have no idea if lower performance is due to more migrants, more computers, less sugar in cereal or whatever.