Had to look that up. Apparently, calculus is required for MBA students to figure out derivatives, rather that stuff like integrals, vector math, partial derivatives or suchlike. Not to mention a lot of MBA programs don’t require an undergraduate degree in business these days.
There are advantages to having an MBA program fed by people who have degrees in their fields such as engineering, medicine, law, etc. The entrants know the technical side of their profession and can add the finance side instead of having MBAs who know finance but know nothing about the industries they work in.
An undergrad degree in biz is the last thing good business schools want. (Such students tend to be weaker than average.)