If I am not mistaken, Pomona was fairly conservative 15-20 years ago.
I'm not sure about Pomona, but nearby Claremont Men's College had some conservative faculty members such as Dr. Harold Rood, who taught courses in international relations and world politics back in the 1960's-1980's. On the football field, Pomona is the arch-rival of my alma mater, Occidental College.
Actually, Pomona college is in my home town of Claremont, which is next door to Pomona. Pomona's become racially diverse, but only if by "racially diverse" you mean overrun with illegal aliens.
You are very mistaken. I knew several Pomona students/alums in the ‘80s (because of a woman I dated) and heard a lot about their time there. Wasn’t the most left-wing of all colleges but certainly very liberal. Of course, most campuses have a variety of elements and aren’t only reflected in their left-liberal aspects, but I have never known Pomona to be anything but very liberal.
Now this prof, of course, is not “liberal” but radical left in her very ILLIBERAL policy. The left is the implosion of true liberalism, destroying freedom and openness in favor of their raging biases.