Basically, if you have membership of a channel and access to material unpaying users do not have, don't post it here. If it has already been uploaded to public sites elsewhere, you may link those sites directly.
The exceptions are graduated talents. I see no reason why you shouldn't post any previously exclusive content created by talents who have graduated or otherwise ceased all activities in a permanent fashion. Nobody is losing money here.
Phase Connect - Fan Work Guidelines - How to Have Fun
One of the points explaining the scope of fan works excludes member content and prohibits its reproduction:
“3. Member-Only content are not subject to these guidelines. Unauthorized reproduction of Member-Only content is prohibited unless otherwise granted by us.“
Is Pippa stating such considered authorization? Maybe, but I would assume since the company has rights to her IP it might not.