It's possible there's deception here, but I also knew a few kids in high school who graduated with their Associates (equivalent to 2 years of college). This can allow a student to skip the general education courses and focus exclusively on major coursework, which depending on the program and how well the student can schedule classes can mean finishing in 2 years.

Their profile also mentions "Stanford Summer Session" in Jun 2022, which does give college credit, so Associates or not they were definitely more active in pursuing a degree than most high school students.