That's not a typo, that's telling you that a shrine to Humbaba is the best place to go to get help learning the skill you're currently on :) I'm not sure if that functionality's actually in place yet, but it gives you a general idea for how to plan out your future skill learning!
hmmm. Obviously I can't check it now but I remember that in every shrine, the bottom part talked about the current giant and if it wasn't associated with the skill you're learning it said " isn't associated with the skill but he can still help you with it". This was the only case I noticed where the giant mentioned in the bottom was different.
This was in the weekend test, maybe it changed since?