Yeah, I'm pretty sure its not betalink since everybody references it being black and this is white. Yes, BMW installed accessory, the body shop I took it to today theorized that the service dept must have installed it rather than the body shop because he had never seen that type of adhesive used on a body panel. He thought it might be some sort of gasket sealant or gasket maker.
In any case, estimates for repainting the trunk are $650-800 so I'm going to end up dropping over a $1k just to switch spoilers. What a pain in the ass.