yes,JFT PT01 once called super-7.but it does not mean that the design of JFT come from J7.
JF-17 Deputychief engineer : PAF combat experience into the design of the jf17 - YouTube
the Deputy chief designer said that the design of JFT come from PAF's combat experience(mainly PAF's F16).he confirm JF17 is a undisputed 4gen (chinese 3rd)fighter in world,he denied the statement of that jf17 is a J7's variant.
The development course of JF17 THUNDER/ FC1 XIAOLONG - YouTube
this cctv interview of all chinese engineer on JF17 project,they also denied the statement of that jf17 is a J7's variant like the Deputy chief designer.indeed,bcz PAF was not satisfied with the original design of SUPER7,So CAC had to redesigned the aircraft .
This is why super-7 was renamed JF17 after the first flight tests of JF17 PT01 in 2003 .The number“17”(>16) means that the new aircraft will beat USA's F16. Do you think a J7's variant can beat USA's F16.LOL.
btw,the real final version of J7 is guizhou JL9.however,JF17 is anything but J7's variant.