The engine opening is circular. The photo was apparently out of promotion, a common human error when inserting pictures in a document in word processing software. Just look at the small holes which should be circular but not. These small holes are either for passing cables and pipes or for weight reduction, there is no reason for them to be non-circular.A second thought about the suspected Dark Sword tail component. Since the engine opening isn't truly circular, will this component be the tail of a new hypersonic aircraft with TBCC engine?