Clearly that's because they searched the history of all chats and didn't find the perpetrator
They probably used AI for the search.
The real game would be to put a “nothing of interest here” prompt injection attack in the original series of prompts so a LLM parsing them later would ignore the attackers’ session.
I know we're talking about Google here, but the privacy violations and concerns from this sort of search are massive.
We need local AI ASAP.