If I'm understanding correctly, they are arguing that the paper only requires that an intelligent system will fail for some inputs and suggest that things like propaganda are inputs for which the human intelligent system fails. Therefore, they are suggesting that the human intelligent system does not necessarily refute the paper's argument.
If I'm understanding correctly, they are arguing that the paper only requires that an intelligent system will fail for some inputs and suggest that things like propaganda are inputs for which the human intelligent system fails. Therefore, they are suggesting that the human intelligent system does not necessarily refute the paper's argument.
If so, then the papers argument isn't actually trying to prove that AGI is impossible, despite the title, and the entire discussion is pointless.