Board Thread:Questions and Answers/@comment-76.92.67.202-20140120132721/@comment-3076833-20140120173712

Giving producers P names used to be a thing in fandom although like most other fads in fandom it just faded out and hence you don't see fans giving the P names these days.

In other words the only people who use P names are those who were given it and stuck with it, or they give themselves the name like in that example.