To me it sems to far fetched that one wrong result would undermine the value of Google stocks (https://www.smh.com.au/business/companies/google-suffers-140b-wipeout-after-bard-ai-chatbot-gives-wrong-answer-20230209-p5cj3a.html).
I think that it is more likely that this is related to financial results/expectations and plans rather than one.
The story of one query does sound appealing for headlines but it I think that there is more. Maybe disbelieve of investors into AI technology at this stage.