If that is a protective film, and it looks suspiciously glossy, where as the OEM carbon fibre is more of a satin finish. Check the roof near the front windshield and see if there's an edge. You can probably use a hairdryer or hot air gun (obviously taking care not to work the area too long) to remove it. If it leaves any residue, then rubbing alcohol or methylated spirits will help lift it off. I'm still struggling to work out why it would have been applied.
2015 i3 REx, 60ah, solar orange. Reversing camera, leather interior, sunroof, park assist, professional navigation.