Everything Larian releases says that the game is a work in progress and everything about it is subject to change. They don’t need to tell you whenever they change something. They are changing things all the time.
Whether you can change out your party after act 1 will be known before the game releases. That’s what review builds are for. Larian isn’t trying to hide anything.
Maybe they just didn’t know whether or not we will be able to change out our party after Act 1. Swen addressed this issue in something. He said he heard the feedback on it but it would take a lot of work to change it because of how companions interact with quests. So it could be on the list of things Larian would like to do but is contingent on budget and time, as all things in video game development are. In that case, promising that the party lock is gone is irresponsible, but saying that it is there is potentially inaccurate. So just deleting that part of the FAQ is acceptable.
