I have no idea how you believe this relates to the comment you replied to.
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.
> No matter how sophisticated, the system MUST fail on some inputs.
Well, no person is immune to propaganda and stupididty, so I don't see it as a huge issue.