Yes, I'm aware of the business policy. That isn't especially relevant, so you didn't need to mention it.
Meanwhile, considering that you do not know almost all of the 20M people on G+, whether they're pseudonyms or not is entirely irrelevant.
A Google Plus account is no proof of identity, and I can adjust the privacy settings sufficient that you can't find me, if I wish.
Yet alternatively, and despite logging in with a pseudonym, I can present enough information to be deserving of trust.
Hence it's stupid to require a different procedure for nicks than for regular names. Parsimony ftw.