Just to be clear, there is no 3D option for After Effects. After Effects composites footage only, it can not handle 3D models. All the Blender exporter does is export positions of objects and Camera into the After Effects coordinate system. These exported objects appear in the After Effects comp as NULL layers. You use these NULL layers to parent the rendered footage from Blender to achieve the illusion of the objects existing in After Effects 3D space. The illusion is broken if you alter the After Effects camera in anyway.
For your project, a turn table model, there is no need to use the exporter at all. Just render your final animation to the specs of the After Effects comp size and hand it off to your brother.