The intent and purpose of the saying is for real life, but it does not rule out that it can be applied on the Bitcointalk forum. Wherever we stand, we must always provide benefits to others so that you are always remembered when you are gone or have left the forum. It doesn't matter if someone uses a forum name that has nothing to do with their life or just uses a user name (Hello, Mmmhh, etc).
The forum does not see how good the name used on the account is, what the forum needs is how much you contribute while you are here, that's what makes you always remembered for giving a lot of education and knowledge to other users.