Of Course it can be a credible threat, did I ever say the JF-17 was useless or something? though it should be noted, detection range and tracking range are very different. You can detect something is out there, but to lock on and fire a missile and guide it there are two different things. For example, there are many radars that can detect the F-35, but to be able to do it clearly enough to where you can track and lock onto it and send a missile is another matter. Then you add on the other complexities of air warfare with EW and other stuff.
Listen this whole BS started when that guy made the claim that the JF-17 is equivalent to the Eurofighter and F-16V, now we seem to be having a very different conversation. If you are not contesting that they are equivalent, then I have no interest in this conversation, b/c the only reason I started arguing is b/c that guy was bloing smoke up his own ass about JF-17s being the equivalent of a Eurofighter and how Pakistani engineers this and that, can create something for $25M that it takes the Western powers $100M to create, exchange rate, purchasing power yada yada yada. and then he started accusing me of being some hindutwa guy hating on Pakistan, which I didn't do. The only issue I have is with people who like to blow smoke up their own ass, whether they are Indians bragging about Tejas, or Pakistanis, Chinese, and even other americans who discredit china in certain aspects.