Yes, it is specifically called out in module four or five.
It's more fun with a well placed blasphemy though, because that locks them out of the plane for 24 hours.
Until they take Beyond Morality and ignore it....
True, true. But unless your entire party has taken Beyond Morality, it's still likely to split the party which is what I'd prefer to do with Blasphemy anyways.
They all did. They were going to be going to a place where the environment was hostile simply because of their alignment and they were in danger of being banished by creatures that can cast Blasphemy. They did the math and all decided to take it to prevent that from happening.
Edit: That actually lead to an argument about the nature of the AP. They complained that the AP encouraged them to play good characters, but then constantly assaulted them with things that punish them for playing good characters, like unhallow effects, or Chaotic-Evil aligned planar travel, or enemies with Smite Good. They all basically decided to cut off the dead weight and very early on the two purely good characters took Worldwound Walker.
As soon as they qualified they all took Beyond Morality.