After I watched that (love Dr. Kipping) I watched Event Horizon's interview with Loeb, and it raises a cpl items that Kipping didn't address (e.g. the shape is a pancake, not cigar).
Kipping does mention this in the video, but he says that the shape could be a cigar, or could be a pancake. I don't think there is hard evidence that it definitly is a pancake.