Well, whats the point in super-secret self-recognition codes (Recognition code 927, I am a potato) when you then do not listen to your time-traveling self? Especially a rationalist of Harrys Level would have to be holding an entire idiot globe to ignore such advice.
But he also knows that he has the rare potential to become a perfect occlumens, and also that “defense” is far superior to “offense”- setting new recognition codes after aquiring immunity to mind-reading seems a trivial thing to do.
Harry actually says that can’t trust something simply because it mentions the recognition code in the chapter that mentions it:
Dear Me,
Please play the game. You can only play the game once in a lifetime. This is an irreplaceable opportunity.
Recognition code 927, I am a potato.
Yours,
You.
Harry nodded slowly. “Recognition code 927, I am a potato” was indeed the message he had worked out in advance—some years earlier, while watching TV—that only he would know. If he had to identify a duplicate of himself as being really him, or something. Just in case. Be Prepared.
Harry couldn’t trust the message, there might be other spells involved. But it ruled out any simple prank. He had definitely written this and he definitely didn’t remember writing it.
Well, whats the point in super-secret self-recognition codes (Recognition code 927, I am a potato) when you then do not listen to your time-traveling self? Especially a rationalist of Harrys Level would have to be holding an entire idiot globe to ignore such advice.
But now Harry knows that mind-reading is a thing.
But he also knows that he has the rare potential to become a perfect occlumens, and also that “defense” is far superior to “offense”- setting new recognition codes after aquiring immunity to mind-reading seems a trivial thing to do.
… which means there’s no point in talking to him until becomes a perfect occlumens.
Harry actually says that can’t trust something simply because it mentions the recognition code in the chapter that mentions it: