you can use a name that is not your real name as long as you don't publicly announce that it is not your real name.
wouldn't that be dishonest? i mean, using another name than your real name before this rule change was part of the culture, it was assumed that people weren't using their real names, and people could be creative and use their "names" to say something about themselves, like "musicman", "tractorgirl", or "firebush69." having a first & last name that's understood by everyone to be questionable seems to defeat the purpose of "cleaning up" permies or however it was phrased. whatevs....