I think this is the case even if you receive a formal CS education. I picked the most difficult or interesting classes and got As in them, and barely passed everything else in order to graduate in 4 years. Many students avoided the hard professors to protect their GPA, so it was really easy to register for them since 25% of students might drop the class.
Probably the most important thing a formal CS education does is expose you to CS fundamentals, but in my experience you end up having to be self-taught in a university setting anyway. Most of the professors I had were more interested in research than in lecturing - many lectures were completely incomprehensible. And even with amazing lecturers, I would still have to spend hundreds of hours reading and practicing on my own.
One of those classes I barely passed was algorithms, since my other workload was too great. I eventually had to self-study this subject years later to pass the tech interview torture chamber.
College was mostly an exercise in self-learning or learning how to learn for me - something I am still reaping the benefits of today.
Definitely agree with this.
I think my data structures professor spent more time talking about chess rather than data structures.