They mentioned the Dominion and the fact the Son’a made Ketracel white.
Or was that a deleted scene?
No, it was in the film, I remember it now. Riker says something about the diplomatic corps being busy with Dominion negotiations. And the scene with Riker and Troi at the computer did mention Ketracel-white.
In-universe, I don't know why the Enterprise-E would have been kept out of the Dominion War, but it could have been largely the same reason why the TOS Enterprise had to sit out the war with the Klingons (I like @Locutus of Bored 's explanation for that, BTW).
Out-of-universe: The Ent-E was always reserved for the movies. There was never any chance that the DS9 showrunners would ever use it, or any other Sovereign-class ship for that matter. That class was created specifically for the big screen and it would look bad if shown in a mere TV series.
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