It should not be possible to read the profile data that an avatar had at the point at which the account was deleted. The continued availability of this information is possibly in breach of privacy laws, including the EU Right to be Forgotten law. If an object was created by a since deleted account then clicking on the creator's name (or the founder's name in a group) should state that this account has left Second Life. This already happens on my.secondlife.com, where it states of deleted accounts "This name is unavailable."