No, the point is I have only heard of one person who did not have USUM 1.2 getting banned, despite several people who were not banned despite playing a pirated and romhacked copy of USUM 1.1. So if it has nothing to do with the USUM 1.2 update why are only users with USUM 1.2 getting banned for the most part and people without USUM 1.2 aren't, even people who play USUM 1.1 romhacks aren't getting banned.
And no, the leak seems to have nothing to do with it either as even people who didn't get it until a week after the release got banned (assuming they updated to 1.2).
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Actually, it is pretty easy to do so. How many people who have played USUM and updated to 1.2 have been banned? How many people who either don't have USUM or haven't updated it to 1.2 (perhaps because they haven't played it in a while or because they are using a romhack which is 1.1 based)? That is pretty strong evidence right there.