I don't think it goes : username (Tom Riddle) => permissions (Defense Professor) or Harry (recognized as Tom Riddle too) would have the Defense Professor permissions.
I mostly assumed that the map and the wards are two different systems, maybe not crafted by the same person (not the same founder if they were made by the 4 founders, or by different headmasters if they were added afterwards).
In canon, the map was made by Harry's dad and his three friends.
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 116.
There is 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.)