Yeah, it would start with the shot of Poe looking concerned (just after he stops talking) and Rose saying in the background: “Listen, it’s on every channel.” Then Merry translates the message to everybody - “The Resistance is dead. The Sith flame will burn. All worlds, surrender or die. The Final Order begins.” Seeing as how the previous scene ends with a transmission between Palps and Pryde, it makes sense that this would be the next step he takes.
Fair points, Burbin. I do agree that there is an implication at the very least that Poe is meant to step up as some sort of leader in TLJ. But it’s unclear if that means he’d actually be THE general. Take a look at the DoTF script. It’s clear that if Carrie Fisher had been alive during the recording of Episode IX that she would have remained in charge of the Resistance. Sure, she might have given Poe some extra duties, but I doubt those would be significantly different than those somebody like D’Acy has. Which is why I’d say there’s still an argument to be made here for the sake of clarity.