The EastPendulum.com blog posted an analysis regarding the likely integration of local WS-10 vector thrust reactors, significantly increasing the maneuverability of the aircraft, especially in the combat phase.
China communicates very little about these Defense programs, and the information that goes back to the West is often the result of Chinese “spotters”, who publish photos and comments on the latest weapon systems. In this case, the WS-10 vector thrust reactor was initially tested on a J-10B light fighter, before being integrated into the flagship of the Chinese aviation industry.
According to the testimonies of Chinese pilots, the J-20 would bring real added value in aerial combat beyond visual range (BVR), particularly against the J-10 and J-11 of the PLA, aircraft far from be devoid of assets. Thrust vectoring will improve the maneuverability of the aircraft, allowing the aircraft to take high angles of attack without stalling.
However, for the moment, this is only speculation, as no objective confirmation has been provided to support this reasoned hypothesis.