I have to say though, that is a great elevated shot of the aircraft. Makes you wonder if it is taken by the PLAAF personnel because it is just too near to be from the outside. Let's just hope the guy taking the picture did not get into trouble for publishing it. Have always been a fan of delta wing aircraft. The idea of speed always comes to mind.
No it is just guys on the roof top. The AAs at CAC doesn't even bother clearing those people out now since there are so many.