Fair question. I meant it should be talked with more nuance and specifics, as the definition of "AGI" is what you make of it.

Also hope my response to tempestn clarifies a bit more.

I'd say this falls into an even more base question...

What is intelligence?

This is a nearly impossible question to answer for human intelligence as the answer could fill libraries. You have subcellular intelligence, cellular level intelligence, organ level intelligence, body systems level intelligence, whole body level intelligence, then our above and beyond animal level intellectual intelligence.

These are all different things that work in concert to keep you alive and everything working, and in a human cannot be separated. But what happens when you have 'intelligence' that isn't worried about staying alive? What parts of the system are or are not important for what we consider human intelligence. It's going to look a lot different than a person.

We know that fusion is a very common process that inevitably happens to even the simplest elements if you just make them hot enough, we just don't know how to do that in a controlled manner. We don't really know what intelligence is, how it came about, or how we would ever recreate it artificially or if that's possible. LLMs are some pretty convincing tricks though but that's on the level of making some loud noises behind a curtain and calling it fusion.