School (Secondary and University) is out for summer break....
(Your point is still right though, <5% had started school when the ChatGPT data was collected)
[1] https://www.pewresearch.org/short-reads/2023/08/25/back-to-s...
Today (August 30), yes, most are back.
But, the stats are for July, where (other than summer sessions, which are usually optional or remedial) most schools are between academic years (even “year round” schools often have a somewhat longer break from late June through July compared to other breaks, to accommodate a brief optional/remedial summer session.) Most schools return with a new school year sometime in August or occasionally early September.