I have a family member who was medical poa for the mother. This individual was removed as poa. The person who was serving as poa is now sharing and releasing info on the mother to others that are not and never involved in the care and treatment of the mother.
This person was removed for a reason, and it would seem that reason continues. The current POA should take steps to notify the health care providers that the situation has changed and communication should be appropriately limited.
There is so much more to the piece of the pie!
Part of the disease process, at least with Alzheimer/dementia, is that the caretaker becomes ,"THE ENEMY."
However, if this is a family situation, some information is generally shared just to keep loved ones in touch. However, since the person was removed from the MPOA, it seems that there may be a breach of trust here, which means that the person shouldn't be involved at all and certainly shouldn't be sharing information.
Within families there is common sense (generally) about how much to share and the POA is often just for legal purposes. In this case, it may be different in which case a it's possible that a law is being broken.
My feeling is that if the person who assigned the POA and then withdrew it feels exposed, this is wrong.
Good luck. You seem to be a concerned person.
Carol