it appears to have factory primer applied over the whole thing, meaning we can't tell how much of it is actually made of composites underneath (we were able to partially tell for the first pictures of J-11D, initially when we had photos of it in flight, as well as for initial pictures of the first J-10B prototype)
Still, good to see clear photos. I'm surprised the Air Force is letting these out tbh.
The nose radome, the tips and the leading and trailing edges of the of the rudders are clearly not painted, as are the hexagonal panels in front of the serial number. This suggest all dielectric panels on the plane are undisguised.
So I don't think they covered the plane with primer out of cunning calculation for secrecy about which part of the plane is composite. My guess is most of the outer surface of the plane is composite, as befitting of a fighter designed after 2000. Where the dielectric panels are and what shape they are reveals what type of radar the plane has in addition to the main one in the nose. This would reveal more about the role and capability of the plane than what parts are composite.