What proofs do you have for your the most stupid accusation?
Going by your logic of accusations & rumors, almost whole of the world believes that Pakistan shared every american tech especially the F-16s, tomahawks etc with China. Till date the famous indian vloggers say with absolute conviction: China don't invent anything, it only "copies" and whatever whichever western nation sells to Pakistan ends up in China. I see no difference between those people and you. If you believe in ridiculous logic that Pakistan passes on advance military technology then you MUST believe it both ways or otherwise grow up!
Also, if people in chinese govt would have same low mentality then why on earth they are marketing their drones and fighter jets all over the world? and stop building export variants. Pakistan did the GREATEST marketing for chinese equipment that China ever could have done. Many in india and western world before last year air battle used to make fun of chinese military hardware as "Made in China" won't work and equipment being not combat proven. So, selling to Pakistan favors China a lot and its defense industry. China wants to sell its gear to Pakistan. When Pakistan military do rigorous testing, it improves chinese military equipment by the forces which have proven battle experience unlike China. Z-10ME improved a lot with our feedback. We would not have shared F-16 technology but we definitely shared the feedback from vast F-16 experience when China was a newbie in 4th gen fighter jet development.
So next time before making silly accusations, think Thoroughly and come up with hard proofs.