This might be me coming from a personal standpoint, but although the idea itself isn't a poor one, and I can easily understand how this would be a great help to users who are trying to delete their account, by creating a How-To in bold, shining lights, openly displayed on an official part of the forum, I'm not sure I would see this as an encouragement to join the game. As a bit of a personal preference, if I was thinking about signing up for a new game, and I saw an official thread concerning deleting my account, it might give me an "off" sort of feeling. If this thread has been created and dubbed "official," lots of people must be trying to delete their accounts, right? "Why would I join the game if it seems like everyone is leaving. Is there something wrong with the game?"
Of course, this may not be the case, but I can't help but see it as a discouragement to newer players. A tutorial for this would be fantastic, and I wouldn't discourage it, but to put the thread as an official topic from the Staff seems a little over-the-top and might not give off a good vibe. However, questions regarding account removal do continue to pop up, so a tutorial wouldn't be a bad idea. I like how you're thinking about the interest of other users, so great suggestion! c: