At least "glorified autocomplete" is technically accurate, even if vastly underestimating the capability of LLMs. It's just trying to make something very impressive sound trivial.

From an external standpoint, talking to another human, it's like the other human says one word and then says the next word. That's just how language works. Humans look like "glorified autocomplete" from this perspective.

I mean, looking at the time evolution of the state of the universe, one could say that all of physics and creation is "glorified autocomplete" to posit a next state of the universe given current and past state.