i also hope they were real pics.but my experience of surfing military forums tells me not.maybe i am wrong this time.
here is another unreasonable point:its weapon load.we know J10B is still being test.it should carry mockup missile or bombs rather than real ones.in fact we have seen J10A being test carrying two multiple missile rails,with four white(or red,i forget) pl12 mockups.and we have confirmed pics that J10A with two rails(3 missile on them) and three fuel tanks.we also have pics J10B tested with two red missile mockups.what i want to point out here is whether J10A or J10B are tested in CAC,the photos taken there only show them with missile mockups.i have never seen pics with both bombs and fuel tanks on a test prototype in CAC.
combining this with the reason in 5903,i think its ps work.
still,my experience maybe wrong as i began to pay attention to those forums since last year.but there are some apparent clues you can follow if something important(J10B,J20,J31,J16,etc.) happen.mostly 'insiders' show up in those threads and 'give out some secrets'.and a thread like that would have hundreds replies in just a few hours.