OK, good find. As you can see from the quote you shared, mprep is calling the list unofficial. Not the rules per se. It's an unofficial list. The word "unofficial" is an adjective describing what kind of list it is. So, it's a list of (official) Bitcointalk rules. It's better we consider them official because if we break them, the admins have valid reasons to ban us. Why the rules are not applied equally on everyone or not at all in some cases, is something entirely different.