I think he's just describing what happens when you tell people Dementor's are Death. He considered that a tactic in the WIzengamut to prevent them from being able to cast a patronus, and gives no thought to the possibility that knowing that would enable them to cast the True Patronus.
I thought that was odd: that they would actually have to understand, and not just be told that Dementors are death. Like in the same way that under-confidence in your ability to perform a physical action actually undermines your ability to do it, which should be relatable if you've ever tried to back-flip on a trampoline or forced yourself to perform an action in spite of an anticipation of pain or great displeasure -- but so long as you expect being able to do it, you can still do it. But if someone just said 'Dementors are death', you'd cast your animal patronus just fine so long as you didn't grok it. Which made me suspicious of Harry's possible tactic in the Wizengamot.
The next discussion thread is here.
This is a new thread to discuss Eliezer Yudkowsky’s Harry Potter and the Methods of Rationality and anything related to it. This thread is intended for discussing chapter 84. The previous thread has passed 500 comments. Comment in the 14th thread until you read chapter 84.
There is now a site dedicated to the story at hpmor.com, which is now the place to go to find the authors notes and all sorts of other goodies. AdeleneDawner has kept an archive of Author’s Notes. (This goes up to the notes for chapter 76, and is now not updating. The authors notes from chapter 77 onwards are on hpmor.com.)
The first 5 discussion threads are on the main page under the harry_potter tag. Threads 6 and on (including this one) are in the discussion section using its separate tag system. Also: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14.
As a reminder, it’s often useful to start your comment by indicating which chapter you are commenting on.
Spoiler Warning: this thread is full of spoilers. With few exceptions, spoilers for MOR and canon are fair game to post, without warning or rot13. More specifically: