Your confusion is completely understandable and justified. All of the Renee Hobbs material is absolutely top shelf and will greatly enhance your understanding and demystify a lot of the confusion. However, University of Phoenix may have overly restrictive policies that are misguided and uninformed. Legal teams have obligations to protect their clients and the safest way is always to say, "No, you can't do that."
In this arena, you, as an educator, have certain rights to fair use of copyrighted material. That is simply fact. Moreover, copyrighted material can and has been used with the provision of fair use to even make money. Hobbs even highlights a case on this precedent. So the fact that you work for a for-profit may not be the mitigating factor. Where you are likely going to have the greatest problem is exercising your rights within a university that has put undue restrictions on you as an employee, be they invalid or not. This might make you more vulnerable to consequences with your employer than subject to copyright infringement or a lawsuit