Right. It’d be good to retain a name drop of Palpatine in some way, as that’s a very filmmaking thing to do. He hasn’t been referred to as Palpatine outside of the prequels. Even so, his name is used in ways one can easily infer who he is several times before it becomes essential to understand who the name refers to.
Perhaps Poe could say “Palpatine’s planning his revenge” during the briefing. He isn’t onscreen when he says the original phrase IIRC.