If you read the wikipedia entry is says that the destination id is required. I assume these must be created somehow and communicated to the sender before being

If you read the wikipedia entry is says that the destination id is required. I assume these must be created somehow and communicated to the sender before being able to receive anything. So long as this is occurring, the way the scheme works, unless you download every message, it could be determined which id belongs to whom. Once you determine that it is easy to track originating packets to that destination since it is not an onion system. Additionally, without side channel communication ( in person or posting that address somewhere publicly ) it is impossible to anonymously communicate to an intended recipient.