Funny, but unless the chatbot is a legal agent of a dealership, it cannot enter into a legally binding contract. It's all very clear (as mud) in contract law. Judging from how easy LLMs are to game, we're a ways off from an "AI" being granted agent status for a business.
Arguably it’s an advertised price, rather than an agent entering into a contract. A pricing error would be potentially enforceable to an extent, but pricing errors are more favourable to a company than a signed contract.