And so, as this version of the theory goes, in the end, Lin-Manuel Miranda, not in character as Alexander, but as the creator of Hamilton, is the one to show Eliza that the story has lived on. This last piece of the puzzle, according to the creator himself, is not the case. Lin-Manuel Miranda posted the theory to Twitter and while he loves that people are analyzing the end, he also makes it clear that at no point on stage is he not playing the role of Alexander Hamilton.
Article source: https://www.cinemablend.com/news/2552256/lin-manuel-miranda-debunks-one-fan-theory-about-hamilton-during-elizas-gasp