As I understand what EY has said, he's concerned that people will see a technique that worked, conclude that wouldn't possibly work on them, and go on believing the problem was solved and there was even less to worry about than before.

I think seeing, say, Tuxedage's victory and hearing that he only chose 8 out of 40 avenues for attack, and even botched one of those, could offset that concern somewhat, but eh.

ETA: well, and it might show the Gatekeeper and the AI player in circumstances that could be harmful to have published, since the AI kinda needs to suspend ethics and attack the gatekeeper psychologically, and there might be personal weaknesses of the Gatekeeper brought up.