No scientific explanation, just intuition from 38 years of playing with bees.............
I do not think that is a viable queen cell. It is too far away from a frame of capped brood, it is on a super frame, not a brood frame, it has only capped drone cells around it. There are very few bees on the frame.
Overall, it just doesn't add up. I'm guessing it is either a queen cell made from a drone larva, or just an oversize, misshaped drone cell.