Not true at all. I have been in university for the last few years and in fact, my chances of ascending were even LOWER than in high school by a significant amount. For actual incels, university is hell (yes there are some benefits like increased social interaction chances, especially with other incels, or being able to join clubs/sports/etc, or networking, and of course getting a degree and education). It is like the classic example of showing a starving prisoner a delicious 5-course meal behind a bulletproof glass wall and letting him smell it, but never even get to touch, taste, or eat it.
If you are truly an incel or non-NT (I am both), it is brutal. Are there a bunch of good-looking, hot, young women around who are wanting to fuck? Yes. Are they fraternity Chad only? Yes. That's about as simple as it gets.
To give some context, before I transferred to my current university, I went to a notorious "party school" in my area. (I actually only went there because I am low-IQcel and it was one of the only ones which accepted me). This university unironically had a 70/30 female-to-male ratio (likely because historically it was a female-only institution). AND I STILL DID NOT GET EVEN THE SLIGHTEST TASTE OF ASCENSION. My current university is more around the 60/40 ratio of female-to-male students, and of course no luck there either.
Also, universities have many people who are not 6'3 white athletic Chads as you suggest, OP. All of the fraternities are, however. But the general university population usually has many different people. There are actually many subhumans who are not aware they are incels. Depending on where you go the races are different too. At my old university, it was mostly Europeans (white) and Africans (black) but at my current one, there are of course whites and blacks, but also many browns and yellows. The current one actually has a lot of South/East Asians, and also South/Central Americans. Some of this is, no doubt due to the university's (and society as a whole) constant shilling of diversity.
And it does not matter what you do as a truecel, nothing will help. I am not very active at my current university, but at my old one I was in 4 different clubs, on 1 sports team, and went to the gym 4 days a week to try and gain muscle for my skinnycel frame. I made friends (who were usually unsuccessful subhumans like myself), went to parties (only the lame ones that were not invite-only or had a fee to get in), and nothing helped me ascend.
To actually get the social benefits of college/university you MUST be Chad. You need to get into a fraternity or exclusive social group that will invite you to exclusive social gatherings, many of which are with sororities with women. Almost all women at colleges are Chad-only, even landwhales. I would know because I've witnessed this myself. Women of any type are usually allowed into parties free of charge or without invites, while the uninvited men are turned away by the doorman instantly. I cannot count how many times I was turned away at a party door due to my subhumanity. The frat parties are the most revered because they have the most alcohol and the most women (the frats are obsessed with keeping a "ratio" at the parties, typically 1 man for every 3 women AT THE LEAST, and this is why they are so exclusive because they do not want it to be a "sausage party"). If you are not Chad and in a fraternity with many social connections, you will suffer massively in college. You will have few to no friends, and get no woman. Your schedule will consist of whatever mundane clubs and sports you do, and school, and that is it. This is the case, especially in the United States and Canada, but it is not unreasonable to assume many foreign universities operate in a similar manner.