If that's the case, if they disagree with the official word, the U of C Law School faculty needs to get on their administration's case and force them to revise their official statement. Until they do, I'll assume that they do indeed regard adjuncts as described in the official statement.
The real professors don’t have to do a thing. There is no reason to force the issue - the statement is just a bunch of words. The real professors have the power over promotion and tenure. The adjuncts have nothing other than the ability to say “I’m a professor.”