In the new addressing scheme, when you subscribe to an exchange a temp queue is created for the subscriber.
The queue deletion depends on the reliability mode.
If reliability mode is "unreliable" or "at-most-once" then the queue should be created with auto-delete=true.
If reliability mode is "at-least-once" then the queue should set auto-delete=false, and the queue will only be deleted if the client app invokes consumer.close().
If x-declare properties include auto-delete=true, then the reliability mode is ignored.