That's the way Chinese military operate, you might never know the designation name of some of the equipment maybe until it was retired from service.
But usually it's different case for export equipment though, unless Pakistan also want to follow the same way Chinese miliatry operate and want the informatiom to be classified.
I was actually looking forward to see more J-10C cockpit pics, and learning more about WS-10B engine's MTBO and service life etc from Pakistan side in the future. Because we've only heard that WS-10 engine is better than AL-31 in performance from the Chinese side, it will be great to see from another party confirming it.