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Look, everyone gets that BMI is not a perfect test, but we're vastly overstating the degree to which it is disputed - it's sort of a classic "so many people think it is overrated that it's actually now underrated" problem. As a baseline measurement, it is as effective or more effective than nearly any other test you can administer quickly and non-invasively, as far as I know (and I'll readily admit to being no expert).
Being skinny is not specific evidence of "knowing all there is to know" about being healthy, but it is evidence of maintaining a healthy weight and body fat ratio. Being obese, however, is certainly specific evidence of being unhealthy - hence why the class is correctly targeted.
There is a perfectly valid argument that the course could do the most benefit if everyone took it, but as currently posed, I don't really see how the school's logic fails.
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