Our VI
@dbdb11 has said that the case detective told him that photos from RT's phone showed that he and BT were there when they said they were. (AFAIK, the VI has not seen the photos.)
That said, we don't know what timeline RT gave LE. IIRC, in media interviews, he said he searched for BT for about an hour before calling 911. So in that account, he missed her around 2:30pm and their walk (and presumably the photos) was before then. The dispatch call log puts the 911 call at 3:26pm. (I'm guessing that's the time of the call but wonder if it could be the time of dispatch.) In a different timeline,
@dbdb11's sister recalled RT telling the family he started to worry about BT at around noon and then called 911. In that account, their walk (and the photos) would be from sometime before noon.
We've discussed those different timelines ad nauseam here already, I'm just saying that even if the detective told the VI that the photos show that RT/BT were there when he said they were, we don't know exactly what that means. JMO