Unfortunately, the guide for Phantom Hourglass is currently unfinished and looks like there is still a lot of work to be done on it. I know work on that particular walkthrough has been stalled in favour of Breath of the Wild, but I'm not sure what's happening with it now because none of the walkthrough staff are involved with the forum.
I did cross reference it though and noticed what you were talking about, so I'll bring it up with the walkthrough staff so they can take a look! Alternatively, I believe the main website has a contact page with which you can point out errors, or the walkthrough itself has a comment section in which you can do the same. In the meantime, I'm going to lock this thread because it isn't forum related.