The title is pretty misleading. Kids who used ChatGPT to get hints/explanations rather than outright getting the answers did as well as those who had no access to ChatGPT. They probably had a much easier time studying/understanding with it so it’s a win for LLMs as a teaching tool imo.
Not everyone can afford a tutor or knows where to find an expert that can answer questions in any given domain. I think such a tool would have made understanding a lot of my college courses a lot easier.