What is written in student records should be treated by another instructor reading it as guidance only as to the student's ability and progress, since all sorts of factors may affect a student's performance, especially their relationship with the instructor.
When I learned to fly, I had an instructor who shouted at me all the time, so that I became more and more anxious about my apparent lack of ability and I completely froze on the controls. He wrote in my record "this woman will never learn to fly!"
I would like to see his face now if he knew that I am an FIC and FIE (fixed wing) and also teach people on helicopters....