What people are interested in is finding a definition for intelligence, that is an exact boundary.

That's why we first considered tool use, being able to plan ahead as intelligence, until we have found that these are not all that rare in the animal kingdom in some shape. Then with the advent of IT what we imagined as impossible turned out to be feasible to solve, while what we though of as easy (e.g. robot movements - a "dumb animal" can move trivially it surely is not hard) turned out to require many decades until we could somewhat imitate.

So the goal post moving of what AI is is.. not moving the goal post. It's not hard to state trivial higher bounds that differentiates human intelligence from anything known to us, like invention of the atomic bomb. LLMs are nowhere near that kind of invention and reasoning capabilities.