Fixing not only the answer but what produced it: the saved note, the summaries that repeated it, the earlier chats still retrieved, and the documents already sent. Updating one row does not necessarily update the uses.
A useful saved note keeps its date and reference — “The project plan confirmed the colleague’s scheduling concern. The earlier claim of hostile intent was unsupported.” Correcting the chat does not correct documents already sent: amend the records and tell the people relying on them what changed.