I assume Yale isn't broke but idk. Universities are just like any other business where they will cut products that aren't making money or performing as well as others. The article talks about the course needing many teacher assistants to field student questions and hold labs, and that originally these costs were covered by a donation which has now run out.

It also could just be some internal politics and blaming it on financials is the public reason.

But you're not wrong that student tuition costs should theoretically go to the courses they sign up for