If people still thinks that it is WS-10TVC with all the clues and hints that we've been bombarded with since mid-2021... I don't know what to say.
Anyhow this is only the first step in a long series of trials and tribulations for the WS-15. ShiLao stated in a recent article that when a twin-engined aircraft flies with only one new engine, it is for testing the engine itself and not engine compatibility with the airframe. When we see the 2041 demonstrator with both WS-15 engines can we say for certain that things are going according to plan. Given that J-20s are being mass produced with WS-10C engines I think it is safe to say that trial induction of WS-15 is at least 5 years away.