I really don’t understand what you mean here. Do you think China can really learn anything from the 117S besides TVC? As I have already mentioned earlier, an upgraded WS-10 is equivalent to the 117S except for TVC and maturity. AFAIK, the Chinese aren’t exactly plucking 117S engines out to place in their J-20 or performing reverse engineering ... there is little the 117S can do for the WS-10 program apart from its TVC features. If they really wanted the 117S engines, they could simply order them by batch ... rather than ordering whole fighter systems.
Just because we don’t have many reports does not mean the program is dead. Same with the J-16D. I suspect it is due to a stricter Chinese national security policy, which has drastically limited the number of pictures ...