Congrats, China, it's 2023 and you've finally stolen enough tech to be able to semi-competently make your own jet engines, just like every other major and minor power has been doing since about 1950. ?
We'll be polite and not mention what an ignorant backwater you got turned into by Mao and the Red Guards, seeing as you're still trying to base your society on derivatives of his bullshit.
The Chinese probably can make good jet engines by 1950s standards, the issue is making them by modern standards. A lot of people knock on China on the jet engine issue ("The Chinese can't even build a jet engine!") but from what I've read, unlike electronics and computer technology which can be much more easily reverse-engineered, jet engines are extremely difficult to reverse engineer, because there's a ton of specialized materials science involved that can't just be worked out by possessing the engine.
So the Chinese have thus lagged a lot on the jet engine front as they are having to close the gap from being a beginner to matching the best of what the United States, Europeans, and Russians produce without the benefit of being able to just copy everyone.
So the thing is that their lack of ability to make good jet engines is not a sign of technical incompetence so much as it just being a technology they can't easily copy, and so are behind in. Like if they got their hands on an F-22, you'd probably see them much more easily copy the avionics, sensors, computer system in it, but not the engines.
en.wikipedia.org
