Definitely looks like Starbucks
However, that's on the main floor of Hall 1 (like right next to one of the airport entrances), could really be for any flight leaving from Hall 1 in that timeframe
Based on their location and the timing, I would almost think that they weren't going for the Frankfurt flight- if they were just arriving at the airport, and the flight hadn't been delayed, they would've missed it
It would be more likely that they would've been on the other side of security and trying to make sure they were at the correct gate had they been going for the Frankfurt flight, just based on timing of video/original flight time
Just my