If this were part of a PADI class, then, yes, PADI should be contacted. PADI has no authority to limit diver activities outside of a class, though.
I wonder if agencies do have some authority through insurance though? Professionals buy insurance - which insures them to teach within their agency's standards. I have not noticed any reference to guiding dives in my policy. Which leads me to wonder if insurance covers guiding activities that violate the professional's agency standards?