Still, it probably ought to be in there. I think. Maybe. I'm kind of torn on it, but the fact that you're confused on them makes me think that it probably ought to be. I apologize for the mistake. You can read more on incantations here or the Zombie Sky Press document, here. (Which I prefer as updated for Pathfinder)
I just wanted to chime in, in case it helps with decisions in future.. I have loved seeing Incantations in other Kobold Press/Open Design products... and been unhappy that there were not clearer directions to help newcomers find the basic rules. *I* know they're from Unearthed Arcana and in the SRD... but a new reader isn't guaranteed to. So, I'd prefer to see an explicit statement "you can find the basic rules...", especially in a magic-focused book like Deep Magic. It is more questionable to include in a less focused book, I think.
Otherwise, very happy with my copy. Though I also agree that involving the backers in proof-reading before committing to print might be a good plan. The issue there, I suspect, is making sure that doesn't throw off the delivery schedule. There are probably as many folks who would push for early delivery regardless of errors as there are folks who would advocate later with more proof-reading.