I know a student who transferred after completing grades 1st-9th at public schools to a private school. While this student had good grade-9 grades at the public school, after the admissions test it was decided the student should start the private school at the 9th grade level. When this student applied for college, the public school’s 9th grade stats were not included as part of the private school’s transcript. His transcript had only the four years of grades at the private school.
Maybe the situation would be the same with the OPs student?