I remember expert systems being considered AI, so LLMs ought to meet that bar as well. They aren't AGI, though, which is a higher one, I guess. I'm not in love with the various terms and the various ways people define them. Even LLM --at what point is it "large"? In a rapidly changing area of both academic and lay understanding, it's understandable for terminology to be a bit unstable. I don't think it's reasonable to say LLMs do reasoning, however. Even when mimicking incredible feats of intelligence, they don't have a grasp of what is true or how truth flows from a set of facts to any other.