Jared Leto has revealed that he is the only person who truly, definitively knows if Deckard is actually a replicant in Blade Runner 2049.
In the belated sequel, Leto plays Niander Wallace, a serial industrialist who specializes in artificial food production, space colonization and, of course, replicant creation.
The scene Leto references appears to have been cut.
The film ultimately doesn’t provide an answer, maintaining the 35-year-old mystery, although it seems the villain at least knew the truth.