Gustavo the random NPC vs Gustavo Mota
Is this really Gustavo Mota? The character model used is not that of Gus Mota, nor is his voice. It is a randomized Hispanic (Vagos) model. If this was intended to be Gus Mota, there would be no reason not to use his model and voice actor.
Well other 2 characters from the story mode ( Paige Harris and Eddie Toh) appear in GTA:Online.
While Paige has some different features, the voice of her is the same.
Same with Eddie, same voice and same character model ( check the page)
Even if this mission ( Bust Out) appears after level 55, Nor Lester nor Gus mentioned this incident.
Again, this is my opinion.