Yes, I agree with Harry on this. In the end, it is only PMI who can decide if this is valid for you or not.
However... allow me to ask you this: You are already PMP certified, so why would you want to take another PMP exam prep class in order to earn PDUs? There are so many other advanced topics in project management out there from which you can earn your PDUs. Would you not rather learn something new than do a very similar course?
Until Next Time,
Cornelius Fichtner, PMP, CSM
President, OSP International LLC