In the US we went common core. That means the school board decides the courses at the beginning of the year, and they set tests designed to ensure the students are learning. But there are two issues. 1. The students are not being taught. Teachers dont get paid enough to care nor provide learning materials, so they just have yhe students read the textbook and do homework until the test. This means students are not learning critical thinking or the material, they merely memorize this weeks material long enough to pass the test. 2. The tests are poorly designed. As I hinted at with point 1, the tests merely ensure that you have memorized this weeks material. They do not and are not designed to ensure that you actually learn.
These issues are by design, not by accident. Teachers pay rates have stagnated along with the rest of the working class, with the idea being to slowly give the working class less and less propetional buying power and therefore economic control. In addition, edicating your populace runs directly contradictory to what the current reigning faction wants. An educated populace is harder to lie to.
The article does not state that. It does, however, mention that AI detection tools were used, and that they failed to detect AI writing 90 something % of the time. It seems extremely likely they used ai detection software.