Thing is, they already *have* zero-zero ejector seats in the K-38 family they bought with their SU-27s and their copies thereof. They also have a line based on Martin Baker Mk7 ejector seats, modeled on examples brought down during the Vietnam War, called the TY-5. What’s going on is typical Chinese national pride - they removed the Russian and copies of Russian ejector seats plus the TY-5s in favor of their indigenously developed TY-7 series of ejector seats.
http://en.people.cn/200411/03/eng20041103_162600.html
https://www.key.aero/article/punching-out
Bad news for the pilot - yikes
Or corruption-- why copy a design known to work when you can skim millions from the procurement system for a totally new dsign?