It probably should be stated that the author of the Daily Nous article traveled a long way from the 18 Penn students graduating in a recent year with pure philosophy “first majors” by including those with philosophy related majors (with the latter apparently mostly pursued by social science students interested in public policy). The author acknowledges this, but doesn’t appear to regard it as especially consequential to the remainder of his analysis. Further, the author didn’t normalize for enrollment. As a proportion of their student bodies, it would be safe to say that quite a few colleges graduate more pure philosophy majors than Penn.
https://nces.ed.gov/collegenavigator/?q=Pennsylvania&s=all&pg=4&id=215062#programs