We can’t determine whether something is intelligent by looking at its mechanism, because we don’t know anything about the mechanism of intelligence.

I agree, and I formalize it like this:

Those who claim LLMs and AGI are distinct categories should present a text processing task, ie text input and text output, that an AGI can do but an LLM cannot.

So far I have not seen any reason not to consider these LLMs to be generally intelligent.