Because I see intelligence as the ability to produce effective actions towards a goal. A more intelligent chess AI beats a less intelligent one by making better moves towards the goal of winning the game
The G in AGI is being able to generalize that intelligence across domains, including those its never seen before, as a human could
So I would fully expect an advanced AGI to be able to pretend to be a human. It has a model of the world, knows how humans act, and could move the android in a human like manner, speak like a human, and learn the skills a human could
Is it conscious or feeling though? Or following the same processes that a human does? That's not necessary. Birds and planes both fly, but they're clearly different things. We (probably) don't need to simulate the brain to create this kind of intelligence
Lets pinch this AGI to test if it 'feels pain'
<Thinking>
Okay, I see that I have received a sharp pinch at 55,77,3 - the elbow region
My goal is to act like a human. In this situation a human would likely exhibit a pain response
A pain response for humans usually involves a facial expression and often a verbal acknowledgement
Humans normally respond quite slow, so I should wait 50ms to react
"Hey! Why did you do that? That hurt!"
...Is that thing human? I bet it'll convince most of the world it is.. and that's terrifying