He said there were long sequences that were identical, not the entirety. Think of it like a song that uses a sample in the hook. He also talked about what I understood as epigenetics and how what we think is junk DNA is actually performing tasks behind scenes like suppressing or augmenting gene expressions which would explain the similarities and differences between humans and greys. He also commented on the symmetry of the physical construction of the DNA strands commenting that there is no way or reason that this would occur naturally. It's almost as if it's an aesthetic choice made by the designer just to stunt on anyone that happened to peep his blueprints.That makes it even more laughable since if the DNA were identical, they'd be human, not alien. Then, you'd have to suppose that THEIR DNA was identical to ours to make that 'hypothesis' viable, but that'd mean their planet of origin was IDENTICAL to Earth in nearly every respect.
Now, correct me if I'm wrong, but I don't recall him saying they found 'alien' DNA.
Straight up stunting on 'em...