I don't think that's an accurate representation of what the estimates are at the link. In particular, the linked page lists undergraduate tuition and fees at $45014/academic year, living expenses at $2100/month (x9 months, leading to $18900/academic year) totaling to $63914 combined tuition+fees+estimated living expenses.
So? That's not $100k/yr. Plus poster said tuition, not total living expenses. And that's just an estimate, one can live more frugally if required.