I finished my graduate degree 13 years ago and my undergraduate 16 years ago. When I started undergrad 20 years ago, I recall my school had a 52% female/48% male biological sex breakdown. That didn't make much of a difference.
My hypothesis is that college campuses are not the dating nirvana that a surface level view of the ratios would indicate. With that said, it is likely better for men that a typical major city, post-college 20s-30s environment.
There's no indication that college campuses are creating extended relationships that last. Most undergrads of typical age of either sex will see their college era relationships dissipate by 25-30. 25-30 is also being generous on the timeline.
For decades, as more people went to college, more people formed extended romantic relationships from random interactions on campus with the man approaching the woman. Around 2000, as the Millennials were first getting to college, formation of couples in college diminished. I've tracked a lot of my contacts from my college years over time on social media. Almost no one today from that cohort is with their college era partner. This also coincides with the Millennials having poor social skills and the rise of internet technology, which worsened the social skills of Millennials. Now that Gen Z is the overwhelming majority of the undergrad population and likely a majority in graduate school, I don't know if this will change.
Even if there's a 60/40 female/male split, a lot of men will simply be ignored. A lot of the STEM guys will be invisible to a lot of women. Those guys won't be in women's classes. Even if they participate in extracurriculars where women are (not a safe assumption), they likely don't have the social skills to seduce. Additionally, if there are extra females on campus, campus is not a self-contained unit. Many of these college campuses are in cities with an oversupply of men, so women can opt in to the general population and date some 20 something recent graduate in that city rather easily. These men will be eager to meet them.
We also don't know how COVID world is affecting the on campus environment. Masking makes it more difficult to do approaches.