What makes it a joke, exactly? nickb shows up under pg's posts. OK. So he has a sock puppet. That's an April Fool's joke?
Applying Occam's Razor, the simpler explanation is that PG actually does use nickb as a sock puppet, made a mistake, and then attempted to cover it up using April Fool's Day as a convenient excuse.
The pipe organ fugue should be right about here.
Ok, enough, I'm loling too hard.