It sounds to me like you’re agreeing with the person above who said ChatGPT isn’t a new threat, but your explanation uses ChatGPT. In other words, “ChatGPT isn’t a new threat because even with a search engine you can use ChatGPT to look through the queries”.
ChatGPT is absolutely a new "threat", at very least because it trivializes the automation of coarse analyzation of unstructured information -- including a user's search history.