If that picture is real are we *sure* that it isn’t just the WS-10 with TVC?
We can't be sure of anything IMO.
We just have to let it simmer a bit and wait it out.
Personally I am just pleasantly surprised that there's been any news about J-20 and a new engine to begin with (whether it's WS-15, or at this stage seemingly less likely WS-10 w/ TVC).
But I won't be surprised if it takes months if not longer for pictures to emerge, not dissimilar to Y-20 with WS-20.
One thing I will say about whether this is J-20 w/ WS-10 and TVC, is that back in the 2018 Zhuhai, Yang Wei answered a reporter's question about whether J-20 may use J-10B's TVC technology with a question of his own, along the lines of "how do you know it's not already using it" -- which to me was strongly alluding to the idea that J-20 at that time had already been testing WS-10 with TVC (single engine or two, we do not know).
I factor that into my assessment of the current rumours.