You're assuming CS class performance correlates with ability.
Most of the people on my CS course hadn't programmed before, and they mostly all passed. But many of them couldn't code at graduation and went into non-programming jobs.
They passed anyway because the university carefully rigged the course to ensure it was possible to get good grades despite being unable to write any sort of non-trivial program. After all what are they going to do, constantly fail 90% of their class and attract questions about their own competence as teachers?
Most of the people on my CS course hadn't programmed before, and they mostly all passed. But many of them couldn't code at graduation and went into non-programming jobs.
They passed anyway because the university carefully rigged the course to ensure it was possible to get good grades despite being unable to write any sort of non-trivial program. After all what are they going to do, constantly fail 90% of their class and attract questions about their own competence as teachers?