Chinese weapons have a reputation of being an international joke. In Sri lankan civil war chinese weapons had very high rates of failure. No one wants to buy reversed engineered 30 year old junk (except pak)
https://www.express.co.uk/news/world/911648/china-plane-crash-fire-latest-military-training-exercise
Footage shows Chinese military plane in flames moments before crash
Chinese have to delete videos they cannot let their reputation of being a world class arms manufacture be tarnished by the fact they make defective garbage.