I won’t touch your statement that someone can house, feed, and transport themselves while being near a university for $833/mo because it’s so patently absurd and out of touch that I don’t even know where to start.
But addressing the costs, you also forgot that tuition is not the only cost of education. The “mandatory fees” part of the calculator you provided is using weasel words and I guarantee there are more fees than the quote. Every class will have an additional lab fee, or computer access fee, or materials fee or some such that is supposedly specific to the class (but really it’s so the administration can hide the fees through complexity). You can expect to pay about $300-800/class/semester for required access to the website you use to turn your homework in (yes, this is a thing now). You can’t buy used textbooks the way you used to be able to because the edition shuffling shenanigans are 100x more intense than they were when you were in school. Also you can expect to pay hundreds per month for a parking pass because anything near transit is out of your housing budget.
My favorite part of random picture communities is that I get to experience little slices of particularly notable life experiences different people have. This still fulfills that for me.