The title is somewhat of a misnomer. It's not errata. Errata, strictly speaking, is a list of errors and their corrections. A long, dry list -- an excellent cure for insomnia.
This includes a nice thank you (for playing his game), skills, clarifications, and instructions on how to create your own Archetypes. A step beyond the original rules, this should have been called "a Companion," or "Expansion," or "Supplement." But it's a minor quibble. And it's free (as of this writing)!
I think thanks are in order to Mr. Freels. He's created a rules-lite game and given us a supplement (and other adventures) for free. He's created something that burnt-out grognards and their children can enjoy, and for that, hats off are in order!