> Borcherds said he currently grades on completion if a student hands in their homework. He admitted that it is “not a very good system,” but at the moment, he has no alternative

He still assigns homework. He's not grading it. The students that want to try, they're free to do it. If they have questions, there are office hours.

The only thing being removed is the grading, not their homework. If they want to learn, they can.