"The Meyet forum is the first Chinese online community that insists the J-20 used the WS-10X in its prototypes, then equip with the WS-15. The CCTV-4 first suggested the WS-10X, now they are also leaning toward the WS-15."
I will trust Meyet over any other sources. It's founder, "Douhou" has impeccable judgment and excellent technical abilities to analysis the issues.
I have made the same assertion that J-20, from day one, was flying with a prototype of Ws-15, with a WS-15 core wrapped around with some WS-10 and AL-31 technologies. And since 2014, it's been flying with a matured WS-15 engine with 3D TVC nozzles, and has, at least,
210kN max. thrust, in the same class as F-35's F135 engine.
"BTW, @Figaro is not stubborn, like those zealous fanboys, from the CD forum."
He has some logical issues that are baffling to me.
"Yes, that victory celebration was too premature."
Seems like,
@Figaro, thinks so too. Right, Figaro? He has referred that thread with the old name.