Transformativeness is a characteristic of such derivative works that makes them transcend, or place in a new light, the underlying works on which they are based.
A summary would not place the original work in a new light. A summary is the same work but shorter. A summary would be infringement.
Student book reports are for educational purposes, which has its own specific exemption under fair use. As does work which is critical of the original, along with news. A critical piece, for example, is transformative because it introduces new ideas, talking about the work and framing it in new ways.
AI meets none of these exemptions with a summary. It’s debatable whether it even could meet these exemptions in the way that it functions.