Who cares? The blood of the civilians who will die is still on his hands. This isn't going to help him at all with the youth vote. If anything it'll make them angrier, since he's transparently only doing this to win reelection than because he actually cares about the people of Gaza.
This kind of gives the game away that it was never actually about Palestine.
Those young people were never really going to vote for Biden to begin with, and when the 10/7 attacks, they just used it as an excuse, to say that they were not voting for him.