Universities aren’t intended to teach everyone. They are intended to weed out those who don’t learn. Incompetent instructors who can’t speak English are a feature, not a bug, in the system.
Weed out? No. Not if they can help it. Heck I recently read an article about a student at a CT university who cannot read or write. Yet there she is, a student in the university… Colleges don’t want to weed anyone out they want to collect tuition and fees for providing a non-education. That’s their purpose today.