In Pakistan J-10 is indeed being termed as FC-20. The reason behind this was more political and Public Relations gimick. It was thought that J-10 may be concieved by the masses as inferior to F-16 already in Pak Airforce inventory. So the Pakistan Government coined this new name to appease the people who know nothing better. Knowing the Pakistani people and the vast majority will believe that they can still beat India only on the strength of their beliefs....well that tells you a lot.
By the way I myself and originally from Pakistan and have been in close contact with previous Air Chief as I held his personal accounts while working in the bank....
ummm, the air chief marshal in the SAME interview said that PAF is looking at ordering 36-40 "F-10s" from China, which is superior to JF-17, and also FC-20s as high-tech aircraft in the future. I think the interview is quoted on page 1 of this thread.
So its pretty obvious that FC-20 is not J-10, and its not a public relations gimmick. You're making wild and unsubstantiated claims about the intelligence of an entire country's population, in a technical forum no less.