I noticed it too. In fact, I thought he said "I did" when he was asked if the knew Vanessa. He mumbled the words and the reporter repeated them - then I understood he said, "I didn't."
Hinky meter goes off for me with this guy. One big reason is him doing the interview! He says he has nothing to hide, but isn't very passionate about his innocence, or concerned that Vanessa was hurt, or that a perp is still on the loose in the community.
I wonder if he watched TV that day via the internet? Would there be a record in his "history" of the timing? If there is no record in his history of watching a video/TV, then that blows that alibi. Of course, regular broadcast TV wouldn't leave a record, AFAIK.
Hinkiness abounds....but yet LE isn't making any moves after DNA collection several days ago, so what does that mean?