I find this claim, which is now common in right-wing ed discourse, really astonishing. It rests at the core of the post-truth vision of "viewpoint diversity": we should not teach the conclusions that research shows to be correct; rather, we should validate empirically discredited ideas just because.
The Cornell report on the Future of the American University is a disaster, mainstreaming and endorsing profoundly reactionary right-wing diagnoses of higher education that have no business in a serious report on what higher ed is or should become.