I think so, too. In the interview, LE says there are "two numbers" that are rapidly logging in and out of snapchat around 8am on Feb 13, 2017. They show the numbers to KAK and ask him which devices those are. My personal feeling is that LE knows which devices those are, because, like you said, the numbers are specific to individual devices, but they are asking KAK to see how he'll respond. His response is that it must have been a phone that he earlier claimed he didn't even own until the Vegas trip, 10 days later (the only other device active in 2017).