While a new study claims an AI tutor significantly boosted student performance in a Dartmouth course, critics are highly skeptical of the research methodology. Detractors point out that the reported statistical gains were driven by a small fraction of fully engaged students and suffered from selection bias due to the lack of a randomized control group. Additionally, mid-experiment design changes and potential overlaps between the AI materials and final exams cast doubt on whether the tool actually improved learning or merely identified inherently high-performing students.