Although The Monitor and Oliver himself have been playing their deal as totally, absolutely, 100% ending in Oliver’s death, The Flash already proved that The Monitor isn’t telling everybody everything, and the Season 7 finale of Arrow revealed that Oliver secretly survived “Crisis,” but spent a couple of decades somewhere seemingly other than Earth-1.
Of course, Arrow fans at least know that his “death” isn’t quite straightforward.
Whatever happens in the crossover, the two post-“Crisis” episodes of Arrow are bound to be very different from what happened pre-“Crisis,” and not just because one of them is a backdoor pilot.