Nearly every genre movie trailer I see has scenes that didn't make the final cut, that's not proof they were last minute cuts.
Anyway, the scene in question is fairly brief, the one with Picard/Data was 3 minutes long almost--no way they completed those FX and then dumped the scene. Budget was way to tight on TNG movies.
Anyway, what's your point, they did
showed a completed Nemesis, FX and all in the theater?
"Fantasy, pure and simple." ------Hengist