So is that a spoiler from another ending or not? I can't click your tags because I've not finished yet.
Check out Oynox's write-up of the three endings. It describes them all perfectly. To answer your question though, yes my second spoiler is one of the endings.
I guess if you want to lay them out it's like this:
ENDING A
ENDING B-1
ENDING B-2
That is because (spoiler regarding end of game),there are at least four different endings in the game.
The following:
1. You decide to leave New Bordeaux behind, Vito takes over the city, finishes the casino and lives in the upper penthouse of it. Lincoln is seen somewhere in California, travels around, finds a girl, however parts with her again. Father James gets occasional postcards from him. (I chose that, fits perfectly into the canon and game overall imho)
2. You decide to rule New Bordeax together with your underbosses. You continue business, wherever you get money from, drugs, sex, etc.. Father James is really sad about that obviously. That is the only option if you really want to continue with the free roam.
3. You decide to rule New Bordeaux alone, kill all of your underbosses and step out of the bayou house. As you enter your car, it blows up. Father James could not stand what you became in the course of events and decided he takes the responsibility that there cannot be another "Sal Marcano" and planted that bomb.
There has to be a fourth one I have not seen if you killed Vito. Maybe his assistant takes the city, I do not know.