Of course not, and that’s not what’s suggested there. The argument is about the students, not the writers–that the lack of general exposure to non-majority viewpoints makes students less able to handle critical analysis of those perspectives when they become the specific focus.
But the other courses in the curriculum–including some also offered to Freshmen–include a more diverse range of writers. These are smallish classes with discussion–surely at least some of these students have already encountered non-majority viewpoints. Most of them have had fine educations before getting into Yale & some may even have read a few books not on required reading lists. Surely they can ask questions.
Critical analysis is critical analysis. Does it matter so much what you are analyzing?