Who called him a "scientist"? He's teaching a Business Administration class, not CS.
Who (other than the
MBA programs routinely bring in people who may have no academic credentials but have real-world experience administering a business, because they provide valuable insight into the application of the principles that the academics lecture about. Even an ill-tempered in-over-his-head schmuck like Ballmer has knowledge that would benefit business students (e.g. all the mistakes he made).
So what's your problem with that?