The Rockbox manual is the official manual, and officially maintained and supported. Who said that the manual is unofficial?
The Simulator manual (such as exists) is in the Wiki, and it has been said here that the wiki is unofficial.
There is only one thing called the manual, and that's what's behind the manual link on the left side of rockbox.org pages. The wiki
page on the simulator is not the simulator manual. You can't just assume our saying "the manual" references a wiki page because you've decided to call it by some other name.
Much like documentation is about something, the simulator simulates something. The manual that describes most of the simulator behavior is the manual for the target it simulates. There are some exceptions here (again - you can't close Rockbox, etc) but the simulator is a development tool and the rest of its expected behavior can be found by examining the source or asking someone.
It's really not that difficult.