Says who?
> Given enough resources, we can have enough particle generators as there are particles in a car.
Given by whom? I said in practice—you can't just assume limitless resources.
> Except when the 300IQ thing is found by chance. When the system is reproducible and you aren't bound by resources, then a small chance means nothing.
We're bound by resources! Highly so! Stop trying to turn practical questions about what humans can actually accomplish into infinite-monkey-infinite-typewriter thought experiments.
> We don't think other humans are intelligent solely by their behaviour
I wouldn't say that, haha
> It's not about encoding the result of having understood. It's about the process of understanding itself.
A process can be encoded into data. Let's assume it takes X gigabytes to encode comprehension of how a hard drive array works. Since data storage does not grow significantly more complex with size (only physically larger), it stands to reason that an X-GB hard drive array can handily store the process for its own comprehension.