>I see how PGP helps with trust, but I do not see how it helps with anonymity. Can you explain what you had in mind?

You'd need a foster an alias that has a proven track record of reliability (like how I continuously try to post under this static 'name').

Once it's established as being reliable, PGP would allow you to prove it comes from that alias.

You'd need to be extremely careful not to connect your alias to your real self (I'm not worried about mine being connected, in-fact, it's important that it remains connected).

Nothing that can be done overnight, unfortunately, but that's how it is with trust, has to be (re-)earned.