I agree, but it depends on what you consider work.
The author in your quote is implying that in public school you get a lot of work done. I don't think this is necessarily true. Unless, we are counting sitting in school for 6 hours each day as work. If we measure work as simple attendance and adherence to a schedule, then it seems that work and school are similar (ie sit in a class lecture v sit in a meeting, with very brief amounts of work in between). But this has nothing to do with output, which most of us would consider a necessary product of work.
The author in your quote is implying that in public school you get a lot of work done. I don't think this is necessarily true. Unless, we are counting sitting in school for 6 hours each day as work. If we measure work as simple attendance and adherence to a schedule, then it seems that work and school are similar (ie sit in a class lecture v sit in a meeting, with very brief amounts of work in between). But this has nothing to do with output, which most of us would consider a necessary product of work.