They're probably fusing both lenses with the Lidar and some other tricks to reliably compute a dense surface. That would explain their suggestion not to move the camera very much, as that would cause a large portion of the mesh to be rebuilt. A blogger exported what appears to be two side by side videos, so maybe the view really is narrow or reconstruction happens at playback. There might also be Lidar data in there that he didn't notice.
Apple bought C3 Technologies a decade ago, and they use this technique to fuse photos from low flying charters to produce the 3d view in Apple Maps.