I'm not Rojo and I'm not in that team, so maybe he did motivate them, maybe they felt moved by how far Leo reached out of his comfort zone to try and lead them in a way that's somewhat new for him.
I don't know, I talk from my point of view, I've been watching this guy for all of his career and I don't recall him gathering round his team to do a pep talk, that's what people have been expecting him to do, but it hasn't been his way.
The Leo I know maybe can talk to an individual player if he feels he can help him, or he'll stay alone, deeply focused (not very motivational for the media, hype-wise, but I think if you're playing with Leo Messi, and he has to be alone, concentrated to give his 100% on the match, hell, you'd feel motivated just to be with him in the pitch, that's an emotion that carries around the team), maybe Rojo thinks it helped just because they won.
Maybe Rojo felt it helped just because they won, I mean, we usually value leadership on victories, and it gets forgotten in loses, or called failure in other extreme cases, end of the day the result of a game goes well beyond the capabilites of what we call leadership in a player, it's out of their control if someone scores or misses.