^^^ They're talking about physical self-publishing. Like printing actual books.
You can earn ad revenue and tips as a regular writer/artist here, but if you're looking to get your work physically published and sold through a distributor, you'll have to look somewhere else.
Either that, or it's a typo they forgot to remove from pre-novel app Tapas. Either way, yes, you can receive tips and ad revenues from your books here, just so long as you've opted into the Ad Rev program and you've applied and been entered into the tips program.