The canteen is only for university students, ordinary citizens are not allowed to enter. An incomprehensible move for a paid canteen. At least they wrote on the website that entry is only by passes.
Most likely they cook very little, ( they don 't have enough for their own )
I live in Minsk, I study here by correspondence. I went to the canteens of universities in Minsk, where prices are lower, you can get bigger and tastier portions.
Here I scored a little, did not eat enough and gave a lot of money for the student.