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There is no certainty that this is not the first time he has done this, and he logged in for only 10 seconds, and during those 10 seconds, someone checked who was currently watching the stream, which would have to be a very big coincidence. And next time, let's say someone makes him angry, and he decides to do something similar again, but next time he logs in under a different account. The fact that he got caught under these circumstances is a big coincidence; at least, I don't know of any other cases like this. And the fact that this is wrong is obvious, even to a fool. He should be punished.
I suggest a ban from tournaments for 6 months.