Hello @Ben117,
If you wish not to recieve communications about the listing you can go to your account settings and click on "Notifications".
Then uncheck all the boxes for which you don't want to receive messages, SMS texts, emails etc.
There may still be some types of notifications that Airbnb always sends to the admin, irrespective of these settings. For example, notifications or calls regarding urgent account issues.
From what I understand you can't make someone else the admin as the listing admin must be the person with legal responsibility for the listing. That is, they are the property owner.