The way ChatGPT “lies” is, the output process is just NLG, even though it is an incredibly sophisticated NLG. By design, ChatGPT is a chatbot, not a search engine, not an expert system, not a knowledge curator.
ChatGPT may be a useful tool for refining or proofreading essays, but I'd never use it to generate one, for fear that it might plagiarize instead of generate content.