OK, I got it to work. A few tips for those who want to use this:
1) Go into your Options, under Controls, and expand the View Options settings.
You need to have it set to the following:
Free Look Controls ==> Set to "Avatar Relative"
Combat Auto Face Camera ==> it should be checked
Combat Auto Face Avatar ==> it should be checked
These settings are needed so that the movement scripts work properly. BTW, you need these set like this for some other OgreBot scripts, like to get your toons to run back up to the fight in TOFSx2. If you raid, you probably do not have these set in this way, since you normally want to have total freedom of movement when you are actually playing a toon.
2) I found that you should start the script right next to Gil, instead of starting it on the Commonlands dock. Maybe it does work starting there, but I had the same result as others described (it hails the fish hehe).
Other than that, following the directions posted works flawlessly, and you can quickly get the faction part of your betrayal quest done using this script. Thanks Kannkor!