Your public key is always clear text, or at a minimum your public key finger print (which can be used via a key-server to find your personal information and public key).

So GnuPG to a degree makes it difficult to hide metadata about yourself as many tools will send your public key + data to a key server as soon as they create your key-pair. This is so when people verify you, your easier to find.

This creates a chicken-in-the-box metadata problem where for people to very your public GnuPG public-key is really you that info has to be public, but for anonymity it can't be .