Yes. And then as Bill further explains in the finale thread:
"vudu, I'm not seeing how my character wasn't "fair"...I wasn't participating in votes and the turn-out of the game didn't change due to the Apprentice's existence...Either way, Khushrenada and Athrun were the last surviving townfolk and that means the Foxes won..."
Bill, himself, confirms that the mafia won the game and that the assistant suicide bomber was just a role for the story which you posted. You keep referring to the story as fact. A little after that post, Blackfootsteps puts the ending this way:
"It was an interesting twist. Seriously guys it didn't really affect the game. Khush was alive at the end and after the credits there was a bit more footage to come that's all. A fun and stressful game all round."
Mafia victory for KnowsNothing, Khushrenada, TVMan, MattVDB and Icecold. Confirmed by the host. Accept it.
EDIT: As a side note, congratulations Bill on the most controversial mafia ending ever. It's still be debated to this day. It's part of what makes Mafia:VI one of the greatest mafia games ever.