If I can see another user's balance as is shown in the tweet of the original poster, that to me is an authorization problem as its concerned with access. Why? B

If I can see another user's balance as is shown in the tweet of the original poster, that to me is an authorization problem as its concerned with access. Why? Because as user A I should not be able to read information of users B to Z. I don't think it's an authentication problem as there's no confirmed problem with proving an assertion as in e.g. (sha3("hello") === "0xabc") in the original post.