Since im not a weapons expert so i cant tell abt its technical aspects. @
The Deterrent he is expert and can tell more abt it.
But even from naked eye these missiles look unusually similar.
J-600T Yıldırım SRBM - Google Search Abdali BRBM - Google Search
Yildrim's own wikipedia page and whose name is written in the very first line besides Turkey and China its development history........
J-600T Yıldırım - Wikipedia, the free encyclopedia
And Abdali came in the limelight for the first time in 1989. And its also based on Chinese tech so what why i guess people say its based on Chinese TOT because fore Pak also to sell tech will need the Chinese permission. So technically i guess its correct to say Yildrim is based on Chinese tech because its base project (abadli) is also Chinese based and its also based on Chinese M-11 missile
Abdali-I - Wikipedia, the free encyclopedia even range of Yildrim and Abdali is almost similar 150 and 180 respectively.
And it being secret is not surprising as the defence matters in which we get involved r usually kept very secret by everyone.