Humans are animals. Part of the paper defends the notion that a lot of human intelligence is tacit based on being embodied in the world as a living organism. The idea that humans are biological robots is only one that came about as metaphor when we created machines and some similarities were noted.
Are we? How do you know this?
Define "general intelligence". Then prove we have it. Then demonstrate that this definition that includes us doesn't include something commonly accepted to not have the same qualities.
Also, if we don't have "general intelligence", what does that mean?
I believe, it is disputed, whether humans are just machines. But it is mostly a matter of definition, I believe.
We haven't figured out how to travel faster than the speed of light. That doesn't necessarily mean it can't be done. But we currently lack the knowledge and resources needed to do it.
Machine comes from mechanic and there is doubt, that general artificial intelligence can be achieved with a mechanical base.
But if you define any complex systema machine, then yeah sure, we humans are machines. Therefore GAI can be achieved with machines. Tautological proof.
Maybe you could discuss whether classical computers could achieve AGI, but I think overall the quest is to build machines with AGI, not necessarily in the form of classical computers.